That's another thing that bugs me but I quit caring on that one since I have both mages at 50. I'm sure I'll be able to play BLM with one of them. There's only one ranged DD class so it's a bigger issue here. Maybe if Musketeer existed and was going to become a strong DD job I'd care less. One thing is for certain, there's going to be a lot of raging at this implementation.
MMOs aren't for soloing. I know you're just stating what SE once said but the idea of having to play a job that's 100% different to your class if you wish to party is just absurd. It's like telling a player who loves tanking that his gladiator is going to become a white mage and if he wishes to tank he'll have to solo.