Which is supposed to be the point of the new system as it seems to be broken down. You will be able to create your own class. Always wanted your Paladin to use dark magic? Wished your RDM was for more than just refresh? Wanted to use SATA as a Mage and still be effective? In theory, all this is now possible. Maybe not use full, but completely possible.
That's how I expect it as well, I just hope they manage to balance it well.
Something that always annoyed the crap out of me in 11 was that I liked playing WAR/MNK.
Unfortunately I could never get a party because I wasn't WAR/NIN(NIN was one job I never got past 20 because I really just hated it, lol.)
Something I fear about this system is that some enterprising gamer will manage to find the "GOD COMBOS" and eventually everyone will be expected to have a specific combo. You aren't playing the GOD HEALER build? Then begone!
I'm hoping to have the kind of flexibility in character building that I found in CoH. This system sounds very promising. It's just a matter of whether or not the current MMO community will allow the flexibility that this has the potential to have.