A lot of the misconceptions about Jax's difficulty to execute with arise from back in the day, when his run cancel combos after ex-bf2d were literally the hardest and most inconsistent thing in the game. I remember when you had to continue with f3, gotcha instead of your optimal f21, 11, f21, gotcha on females, unless you were a god and never messed up anything ever.
Fortuneately, a patch came along and fixed it, and f21 followups after your ex overhead aren't too bad anymore.
That said, one must always be wary using d1d2 after blockstun, lest you hit the buttons too fast and find your d1 swallowed up and accidentally execute your -17 d2.
And the buffer window for quad grab feels ridiculously small after certain tic options, like d1, d1d2, and even f3, when you consider how awkward and unwieldly dbf1b is to execute. Like, it is seriously annoying to get down. Took me more time to get d1/d1d2 quad down than it took me to get HW's 123 RC 123 down.
Don't really play HW so I can't comment on [starter] RC 3b2, though. Pulled it off in practice a few times but never attempted in game. Quad tics feel harder though, and for stupid reasons. Special cancel inputting should never be that hard, IMO. Mechanical flaw in the game.
Agree that high level Jax shit can be very difficult relative to other characters. You've got to always hit confirm off of f21 in order to maximize your opportunities and minimize the need to take a risk with 12/123 into ex-overhead DP shennanigans. Also, because of the low-profilabilty of much of his pressure, you have to mix people up well with your mids in order to keep the momentum going for you. When people really know the matchup, it can be a struggle with him. Jax has an excess of great tools but an absence of dirt.
