There are ~25k total different MTG cards. Who cares if even 1k of them are for collabs (as long as they don't contain broken cards that end up in tournament play)?
Some folks really love the story of MtG. Think of it as if you were expected, as a dungeon master, to allow your players to be Spongebob. Some folks won’t care, others will have their experience ruined.
The sets also increase the number of legal cards you have to purchase to keep up with the meta.
The sets also increase the number of legal cards you have to purchase to keep up with the meta.