Host kick has always seemed like the lesser of evils, in my opinion. Any other method to deal with actual problematic players would just make it potentially more difficult to deal with them, and could even be exploited by them.
A vote kick requiring 3 votes would make it too difficult to kick anyone: what one person might see as a troll, another might see as an inexperienced player simply learning how to play the game.
Additionally, 2 players working together could simply join a 2 player game, and now neither can be kicked, so they’re free to troll to their heart’s content.
A vote kick requiring 2 votes might work, but you run into an even more troubling issue with that: now the aforementioned tag-team trolls can now go into 1 and 2 player games and kick out the people that were just playing.
Majority vote could work, but how does it get handled in a 2 player game? First passed the post seems like the obvious answer, but now that allows the above issue to reach a sort of apex: now single players can join other single players and kick them from their own games.
Making the host immune to being kicked holds some promise as a solution, however it only acts as a partial solution to trolls kicking out players from people’s games, since they could still kick out the other player the host is playing with, then leave immediately after.
A solution to that would be to allow the host to choose who can’t be kicked, but that’s just the inverse of the current system and is unlikely to really help. Especially since the host is sometimes the problematic player, and so making them or anyone else immune to being kicked completely undermines whatever kick system is put in place.
While there may be other ways to change the kick system, I doubt that they’re anymore fair AND less open to exploitation. Seems best to simply give the host unilateral authority to kick who they want as it allows them to act quickly against trolls and, if the host is the problem, others can simply leave.
However, I’ll admit that I’m rather pessimistic about this (anonymity brings out the worst in people) and none of this accounts for the (at least on PS4) small playerbase that may not even have trolls in it at this point.