That actually is a fair point for the three main classes. Those are three ways of life one would probably be unlikely to just drop for a few weeks at a time. With the sub-classes though, it makes perfect sense why those arent immediately open in a new realm.
People asking you to switch Courtier for Warrior to help out a war effort is annoying, especially considering class choice is a player choice. I never like seeing things like that thrown around even if they are meant as suggestions since that alone sort of breaks into OOC territory as far as Im concerned.