I don't know where to put a suggestion, so i feel like this may be the only spot i can voice my opinion. So, here i go.

Minecraft skeletons are incredibly smart ever since the AI update for skeletons. Even skeletons also pose quite a threat, as they are often too accurate. However, i realize skeletons are truly the only problem.

And i realized, well, wait a minute, Zombies and spiders, are both still using the same AI.

A zombie doesn't even try to put itself out in the shade, or the water, and i feel this is kind of not right, seeing as zombies do still have a brain; but skeletons quite literally don't have a brain, in fact, they have no organs at all. but yet, their smarter then something that should actually have a better mind, awareness, etc

so, my suggestion, is Please give the zombie, at least, some more quirks, skeletons are so good that they literally have aimbot. 

I feel it would be nice if zombies can sprint, not that fast, but to allow them to catch up to you if your far away, they can have a limited stamina, and when they go back to wandering, that stamina builds up again.

Zombies should also have a new set of sounds; such as growling at the player; like how the new warden has sounds when he attacks you.

There could be alternate variations of the land-zombie, such as runner zombies, that are on all 4s, and don't have legs, while this might be a bit more... over the top, it would add more variations, but i don't expect this one to be added if the update is considered, but would be cool for maybe, a hard mode exclusive.

I feel zombies should also no longer burn in the day. Humans don't burn in the day. Zombies are dead humans, so, why should they burn in the day? i feel like the sun should make them less violent, for example, they get slower in the sun, and, they also stop spawning in the sun still, but the remainder doesn't just burn out.

I think this would add more difficulty to Minecraft, and more variety. I think it would honestly be perfect considering the new caves in the upcoming update.