SilverfireSage
Explorer
It's very easy to temporarily get a bonus that will hit anything in the game on a 2+ and not hard to get a 90% hit rate the majority of the time on the majority of the monsters. And that is with only a handful of magic items and no splat books out yet! As more spells, abilities and magic items come out this problem will only get worse.
On the other side of the equation the magic items we've gotten just from HotDQ you can easily have a 27AC CHR class character running around. An AC that can be even higher with some work.
One of the benefits we were supposed to get out of bounded accuracy was low level creatures remaining viable, but as other threads have shown, the monsters are built with an attack bonus that tends to climb as their CR climbs. So the game itself isn't even built around bounded accuracy to begin with.
Anyone that thinks 5E has bounded accuracy is kidding themselves or don't know what it even is.
I call hogwash on all of this. Give us specific examples and the math because this seems impossible.