The reasons why the classes are "mirrors" of each other is for balance. If the factions had different abilities, different, it would be an absolute nightmare to balance them (it is already, apparently). If you've tracked the changes since launch, a lot of them have been tweeks based on players complaining they weren't close enough, and that one ended up being slightly faster or more powerful (i.e. the old Jedi Consular Project) Same reason why WoW continuously moved away from having faction-only abilities and classes and racial abilities, and just started homogenizing them all.
This is the problem with a game sharing PVP and PVE dynamics, they always fight with each other.
This guy missed it. I did not. I'm kinda a lil upset(i Main a Powertech) and shocked no one has ever pointed it out.