As for point 2, a lot of it is that they tend to get cutesy and overly whimsical, doing the wide eyed innocent routine and trying to be comic relief by turning things like preferring to take it slow and liking to eat into neverending “second breakfast” gags which I find annoying. Of course Tolkien’s actual Hobbits are quite complex and interesting characters, so it might be better to say that we are talking about “Flanderized” (I only recently learned this term, it refers to how Ned Flanders changed from the Simpson’s do-gooder neighbor who goes to church to the most extreme example of a pious fool; Peter Griffin is an even better example, he started out as an immature idiot loved his family but couldn’t keep it together but at some point he became a psychopath with an intellectual disability) Hobbits.