I would accept F12 jailing if they added a gap to the third hit and/or reduced the plus frames like Shang's B1 string. A thirteen frame, advancing, hit confirmable mid that's plus on block? Hey man that's all I'm asking for
F12 is literally his only mid starter and it's 13 frames, it gets beat out by pretty much every single poke in the game and every good, spammable mid. Cassie, Jacqui, Geras, Kang, Kabal etc. all have mid starters that annihilate F12.
The advancing quality of the string is SUPER overblown as well, it doesn't go near as far as most people think and can whiff on crouching characters at a distance that it should hit. Kotal Kahn's strings are only a few frames more and go WAY farther, and hit way way more consistently.
Hit confirmable only REALLY matters in Ratbag. In arguably his best variation Ripper, you get pretty much absolutely nothing for hitconfirming it. A big, whopping 13% for F12xBall, EX for a massive 19%. In Dirtbag, the best thing you get out of it is applying acid for 15% and the chance to MAYBE use the molotov after. You can get F12, Vege-Mighty into Kano ball for 15% but F12 into acid does basically the same exact damage with the additional DoT... So like. Is it being hit confirmable even that big of deal?
Saying it's plus on block like it's criminal to be any amount of plus on block and not a flawless blockable string. It's plus 2. Doesn't guarantee anything but a blocked low poke. Because. Again. No mids.
Geras has an 11 frame advancing mid that's only slightly shorter than Kano's F1. It tick throws on the first hit into a command throw that has MASSIVE corner carry. Kano's F12 doesn't tick throw at any point. Geras's second hit in that string is hit confirmable into a full combo for 25% into a sand clone set up that can beat every wake up option in the game except short delay wakeup which is getting changed OR cash out for 35% into the throw that carries to the corner. Kano's F12 hit confirms into kano ball, only dealing 13% and leaving Kano at bad spacing.... Geras's jumping body splash attack tick throws into his command grab.
Making Kano's f 1,2 jail on every character wouldn't be even close to the degenerate shit that most characters have in the mids department.