As for deducing AC, sure, you shouldn't really know what your opponent's AC is t the outset, at least until you have defeated them or worked it out yourself. Other D&D games have you making skill checks to figure out that kind of enemy info as you fight/before - I'd like that idea. Of course, they could display other animations for categories of misses (like graze etc.) but that adds a lot to the animation burden/cost. Every model would need these extra animation cycles. I think there are more important things for them to fix - bugs, core mechanics issues, balancing, possible party size changes etc.
There really doesn’t need to be an animation burden for this. Just changing the text popup from ‘Miss’ to the appropriate one would be enough. If they went ahead and animated it that would be incredible though.