I play 1.12 (since I'm pretty sure Optifine and Forge aren't compatible in 1.13+) so I haven't been keeping up with the newest additions to Minecraft, but...
As some other people have stated in this thread, I think more functional things need to be added. It's cool that the development team is focusing on the ambiance of the game (because as much as I love the old versions that was something they lacked), but I feel it is unnecessary to keep adding eye candy without it really serving a purpose.
I think the mobs are cute; I love the foxes and dolphins, for instance, but "wow they eat itmes!!1 an look at items on thr gorund" shouldn't be passed off as that mob's only feature. I think more time should be dedicated to trying to find that balance between "cute" and "useful", a balance most apparent in the older tameables such as wolves and ocelots.