And again, balance is important for non-raid content too.

Using your BRD argument (and they're nowhere as bad as you paint them), if you had your way, not only would we have the possibility of being stuck with 2 BRDs, we could get 2 badly spec'd BRDs. People already complain about getting stuck with bad players in DF, and you want to multiply the problem several fold by telling SE to just ignore job balance.

And concerning your "fun" argument. I already addressed it earlier. Being stuck with underperforming jobs is not fun.