Horwath
Legend
yeah, there is always a bridge too far.I had a different problem one campaign. The player wanted to change PCs based on the dungeon we were heading to. I think there was a elf ranger to start until we reached the underground dungeon where suddenly he wanted to play the dwarf fighter who has darkvision. There was the halfling thief who came out in the city and the a wizard ... I could not take it. It was some sort of min/max based on the location.
He kind of explained it as the PCs were all part of an adventuring group. I wanted to help and could maybe have some go along with the party as more like henchmen or NPCs until the dungeon where one of them goes in and the others stays with the horses. It became too many problems since some of them received gold and magic and the others did not. They were not advancing as fast and fell a level or two behind and I would not allow the ranger's magic bow to become a magical axe when the dwarf wanted to use it. The rest of the players were also getting annoyed and we needed to shut it down.
there is one thing about not liking a feature or the feature does not deliver what you thought it will do.
or someone simply got bored with a character, especially new players after few sessions that were "advised" to make "simple" characters.
on the other hand, maybe they want to play a SpecOp team that is perfectly prepared and preselected for each "mission".
we played few times that way. it's fun if you focus on tactical preparation and not so much for roleplay and long term campaigning.