Recognizing that Ewers is a slow processor and saying so isn't calling him an idiot at all. One is objective analysis; the other is subjective and somewhat of an insult. There are plenty of incredibly smart people who are slow and deliberate thinkers. Ewers might be a genius for all we know, but he needs all the time he can get to read the defense.
One thing high performers do is identify reality, good or bad, and deal with it. You can't overcome it if you don't acknowledge it. Mediocre people and cats bury their shit. You can pretend it's not there, but it'll start stinking eventually.
If your QB needs the extra time, then you give him the extra time. It's that simple.
Since you seem to want to make it personal, here's an unveiled opinion. You're a fucking douchebag who gets his panties in a bunch whenever someone points out deficiencies or is critical of obvious flaws and you do your snarky little passive-aggressive routine from behind the safety of your keyboard. If you don't like what I have to say, then fuck off and ignore it.