Yes this is an input delay issue, but it has relations to unwanted whiffing. As I've said earlier, issues like this or similar like this, can happen in any game. And
@ImperatrixSindel just told you (and he says he plays SF5) that SF5 also have hitbox/hurtbox issues that still be there or have used to be there.
On top of that, if you stopped playing SF5 because you thought that it was shit, how can you compare between that and IJ2 in any regard (like whiffing issues) and saying that SF5 is a much more competitive game then IJ2? You stopped playing both SF5 and IJ2, so basically, for you, both games aren't competitive enough.
I mean, no offense, but like I said before, if you're gonna complain, at least be reasonable and consistent with your rants.