I agree! On one of my saves, I have built next to a plain. On a short walk I encounter 3-4 individual patrols. It's almost getting annoying. They're op. Expecially the beast, hitting through walls and such. One thing I've noticed is how all Illagers seem to shoot at me whenever I only hit one of them, not sure whether this is a defensive reaction, but it happens. And I've got so so so many Illager banners and emeralds, I expect this to be caused by enchantments but still. Their spawn rate is too high. But I still love the characters and idea of these new mobs (:
I had this happen to me just now. Zombie Villager caught on fire in my house while standing underneath a closed trapdoor leading out of the roof. It was daytime, but rain was pouring down. It burned to death before it transformed back..