In my opinion, a problem with firebrand's design comes from this one aspect.
Instead of making the 3 tomes a grandmaster trait choice (like the dodges for daredevil or how the adept tier traits let scrapper chose between 3 versions of the function gyro), firebrand gets access to all 3 tomes by simply picking the elite spec.
These tomes provide way too much.
If they had made it a grandmaster decision, then firebrands would have to pick one thing they want to be great at.
Do you want condition damage? Pick the tome of justice.
Want healing? Pick the tome of resolve.
Want to provide boons? Pick the tome of courage.
But how the system currently works, firebrand gets the best of 3 worlds. No wonder they are top dogs in high end PvE content.