Honestly we don't know enough spesifics about the hirelings at this point. If they can be
fully customized, meaning class/name/race/appearance (a complete respec) like the PC, then fine. Seeing as they're fully fleshed out already and apparently have had some effort put into them, that's probably not the case though.
the use of the word "temporary"
Is also unpleasant. While the other companions can leave us for various reasons, Larian have never described them as being "temporary".