People way overstate frame data in what you can/can't react to anyway -- Skarlet's B1 mid is same frames as Sub's OH and nobody complains about it not being reactable, it's more about how unique the startup on the animation looks. Fuck, Skarlet's F4 is only 13f but if you can't react to that you're probably fucking blind or playing on a TV and not a monitor, it has a super obvious startup animation.
In fact, anyone who isn't playing on a 1ms monitor should probably just stay out of the convo about what's reactable altogether tbh, go ask your moms to upgrade your shit if you want to have convos about competitive balance
I'll refer you to do a search on reaction timing here on TYM this has all been proved before the program used was millia blocker 2.0 which tested your reaction timing vs Oh/Low and you where only supposed to press on the Overhead only.
The reason this is important is because its much easier to react to things you are looking for (1 move) than it is 4 things all at different timing and different responses.
Players like Sonic Fox, ForeverKing, HoneyBee, Reo ect all took the test and they got 20f average reaction every time except for sonics who did get several results at 19f consistently.
It is well known you can can react to moves below 18f when its truly random bit if you are focusing on it waiting for the move you can (this is a read) not a reaction.
BTW we all know TVs have very bad input delay usually 70ms on average but I have a 2ms monitor that is approved by Esports and I can't react to stuff under 18f on raw reaction and neither can Sonic Fox and he has stated so before on here.
Look at Sonic's HoneyBees, Reos, Dragons, Scars streams and you will see they don't flawless block everything and only do it in gaps or off moves they know are -5 on block which guarantees FB off a read. There is only a 3f window to Flawless Block so if you are trying to Flawless Block Shangs B1/F2/1 its near impossible to consistently do it because they all have different startup B1 is 14f, F2 is 17f(3frame difference), and s1 which is 8f startup a huge difference and completely different timing.
Here is the discussion showing its not possible to react to less than 19f moves when multiple moves are coming instead of one:
if u can react to 18 frame overhead, then it means that killer frosts entire game was bullshit.
testyourmight.com