Hmmm, it appears you are knew to the game, so many things are unkown to you, so let me give you some clear answers.
Jin f4~zen is -1 on block, but the fastest followup is 13 frame, meaning you can interrupt with anything that is i13 or faster. He can cancel to make it safe but that's him being at -6 after.
Kazuya has df2 which is i13 its a CH launcher though its not safe its a homing meaning it tracks both sides and its a mid no one can crush that.
And if you are having troubles dealing with F4~zen, and don't want to interrupt, just sidewalk right, the best launcher and the best mid out of f4~zen have no track, you can also duck and react to a mid just as easy.
About b4 out of Zen? Jin doesn't have such a thing, i think you mean 4, which is super slow super reactable, and now in T7 is launch punishable if you block it because they added an blockstun animation to it, its at the very least -31 on block and you should be able to launch that with any character in the game. But if you really mean Jin b4, then your opponent is canceling Zen and then apply an i17 move, which none of those would work anyway, if you just df2 them which is the best counter to apply against a Jin that tries to do too much.
Jin's ff3 is +1 on block, i23 and doesn't have range at all, standard mishimas ff3 not only is much more faster like i20 or so, covers much range, forces crouch and its +3 on block, fail to see the logic here.
On top of it, 123 is now 0 on block, and has a 10f gap where you can jab Jin out of each options.
You complaining about nerfing ff3 because its a string its a clear sign that you just didn't really lab.
Kazuya's ws1, 2 is i13, which can indeed launch punish any Jin blocked low, this includes db4, d3, d4, ANY LOW that jin has, which are all -13 at best, this is pretty much Kazuya's specialty jin can't even attack low in this MU without being at risk.
Jin ws3 is i16 just as his f4, but it lack range, the fastest move in tekken all start at 10 frames, i think i know why its hitting you so much, will make sure to explain down in the topic.
Sure, but the best parry in the game ONLY becomes the best parry in the game if you as an attacker get too predictable with your offense, patterns and such, Jin has that parry because he is able to avoid things no other character in the game can, but he still needs to see it happen, make an insane correct guess, press the code on the right time and then apply it, it doesn't magically makes him super dumb, on top of it, Jin parry also doesn't launch everything it parries, it depends on how much recovery those moves have, so mostly the juicy stuff, its pretty much a tool to destroy people who tries to do too much without being too conservative.
FF2 is a straight line mid, but the reason you're getting hit by this its not because the move is too good, you are having a hard time using the 3D environment to avoid moves in tekken, i will cut you some slack into this because its not easy to do, but it requires practicing an time investing, if you don't learn how to move in 3D environment mishimas and characters a like (Jin, Bryan, Nina, kazumi, Paul, Claudio, steve, dragunov, feng etc) are all going to kill you if you don't.
I already said before, Jin has tools for every specific situation, that's how he is designed, his gameplan its a combination the most suitable moves coming together against a certain player not the character itself, speed? kazuya is much more oppressive than Jin, he is just harder.
I think you being new to the game, you made a wrong decision picking Kazuya as the first character to learn, he is pretty much the highest skill ceiling required to play in the game, and it takes YEARS to be good with Kazuya, movement is key part of his movement, something i'm pretty sure you don't have it, reason why i don't think you should start the game with him. comparing moves with same speed and proprieties its not a thing, they are all different, the only thing Jin and Kazuya have almost in common is the electric, but even that is different because Jin's EWHF tracks to the right and its always i14, while Kazuya's EWGF tracks to the left and has greater pushback than Jin's and it can be made i13.
Crazy buffs? The most notable buff Jin has in T7 is the ability to do combos as everybody else in the game, something he always lacked past games, so in this game, if you over extend yourself against jin and he finds an opening he will hit you so hard that you will long into TYM to complain with Eddy Wang.
Most notably, a natural hit launcher EWHF, ability to wall carry for any of his launchers, and he got heavily nerfed on many strings and buttons, but he got some better ones too. I love this Jin now i feel like every character in the game when i play him.
Your problem is being new to the game, as i said before but this time i will cover Kazuya for you, Kazuya is a character that requires you to be a lab monster, different from Heihachi who is the offense power house, which has a lot of CH moves, best 0 range pokes on top of being a mishima. Devil Jin who has a balance between offense and defense and has even better pokes than hehachi, Kazuya doesn't have any of those, that doesn't mean he is weaker, he is just the most defensive character in the game.
The cornerstone of mastering kazuya are:
Execution, his electric its his main pressure tool, you need to be able to use that, if he has a hole in his game, he dies.
Movement, you need to be able to float like a butterfly and sting like a bee, pretty sure you don't have that
in deck otherwise you wouldn't be complaining as much
50-50s, kazuya needs to use 50-50s whenever he can to enforce easy wins, but to do that you need to be
able to learn movement first, meaning wavedash mixups, canceling with CD4, ff3 and iws1, 2 or iws2, just a few examples.
His strongest tools are his 50-50s ones, ff3, cd4, EWHF, super hard to react to his 50-50, the rest its attached to your capacity of recognizing how unsafe and how to deal with certain moves in the game and punishing accordingly, that is why kazuya has the best punishes in the game, 13f laucher high or mid
Kazuya is one of the hardest characters to play, you need to know the holes of your opponent just as jin, but those are tools you can figure out to beat, you just didn't lab.
Jin is somewhat similar, he doesn't have the best tools he just has tools for all possible situations
but none of those tools are going to carry him because they can be easy to deal if you get used to it, not kazuya, his 50-50 game is always going to be threatening because you can't react to both options.
here, have a learn
