Well the amount of knockdowns is a separate issue.
As for copying features, it's a pretty common thing across the board. One of the ARCs defining features was the autoroll but that was removed, what else could be used? Most of what the ARC does is also done by something else in one way or another, EE3 is very similar to the M5, Jedi and Sith have similar (better) dexterity, Clones have stamina, Mandalorians have rockets and dual pistols. I don't think reusing abilities is a problem.
Hell remove them from BH, they got tons of stuff already.
As for buttons, a third class special would help with expansion of abilities IMO. Combining saber stance and weapon mode was a good idea, maybe do the same for "use force power" with class special 3?