And as for the second one I don’t understand how it complicates it

It is objectively not the easiest thing to remember which pronouns each and every single person goes by, especially when there are people who change their preferred pronouns every week or so. I think using more pronouns than the canonical he/she/they is absolutely reasonable (I obviously don't want people to be uncomfortable), but the people asking to use these other pronouns also need to be reasonable about it (and clearly not all of them are).

Also, about neopronouns, I have seen people on the internet go by "bugs/bugself" or "revenge/revengeself", and I think this is what the first commenter was referring about. I honestly hope we could all agree that that is fucking crazy and one cannot really ask another person to refer to them as that.