What limitations would those be?
Two things mainly ...
1) Hirelings are presented in last Community Update as "temporary" party members ...
Im not really sure what that is supposed to mean, but it dont make me feel like them being someone who will stick to my party trough whole adventure. :-/
2) Races seems to be set in stone.
I know its normal for DnD to play with diverse parties, but i was really looking forward for my "all Githyanki" full evil, full racist, full Githyanki party ...
For wich by the way, even work around cause problems (as i complained countless times in last few weeks) bcs game conciders our Tavs created this way as PCs no matter how many players is curently present ... and it blocks out certain conversations with companions, replacing them with meaningless (for single player) stating our opinion for PCs ... so gather some serious reputation with Lae'zel would be conciderably more difficiult using this way. :-/
And since hirelings are not supposed (to my knowledge) to have ANY influence on the story whatsoever ... i see no reason for such limits. :-/