I was not suggesting it should be. I was simply pointing out that certain builds and power combos are more efficient. Remove the word "farm" and they will still clear maps much more efficiently than others. At least to me, that does not make them overpowered per se, just more efficient.
Personally, I do think different roles/ATs should experience the game differently. That is a big part of the uniqueness they have and provides flavor for differing tastes in style of play. Measuring the ability to solo between powersets within an archetype was not what you posted. You were comparing a scrapper to a defender.