The difference with those roles is that Backups go into the game knowing that they can eventually become a PR, and in the case of like a Backup Tracker, they know what role they would take over.In post 463, TemporalLich wrote:I don't think Town Vanillaizer would be too much to ask for but it does technically violate an expectation of Normal (Roles should never change), but Backup (technically not if you consider it a modifier and not part of a role) and UBackup (no excuse there) also violate that expectation.
With Vanillaizer, the vanillaized player doesn't know about it until they are vanillaized. I think if it were to be included in a normal game it would need to be explicitly stated that the game has a vanillaizer.