If the movement of this game was more like Street Fighter or an anime fighter, I'd totally agree with you.
For traditional 2D fighting games, smaller tech windows, teching on a read, and single button techs has been the way it's been for decades.
The movement of MK11 is a stiffer than those games though. It's more like Tekken.
What I mean by that is that in Street Fighter and some anime fighters every character could universally fake out a grab by walking forward then backwards to bait the grab animation for a whiff punish. In Tekken though, because of the stiffer movement, the grabs are balanced out by making them into HIGHs that can be teched multiple different ways depending on which grab the offender chose.
MK11 chose the same style as Tekken because both incorporate the ability to duck under high attacks. This already gives grabs a HUGE counter so making the grabs a bit more of a mixup if they do land makes up for them only doing only 14%.
Like I said before, if they changed it to a single button press to tech it'd be way too easy because even I already tech grabs 90% of the time, whether it's the correct direction or not.
That's because you could tech grabs on reaction 100% of the time if you practice, just like Tekken.
If they made the switch to single button teching, they'd have to lower the tech window to something smaller to compensate for it to be one button, but they'd run the possibility of grabs being teched even less and becoming even more common because techs would only be done on reads.
A smart strategy in games like Street Fighter 5 is to just eat a throw or two because they'll do significantly less damage and the tech window is smaller, making the tech more of a read and less of a reaction.
If MK11 had grab techs that were more reads than reactions, I just don't think it'd end well imo.
I really do think the way they have it right now is a fine.