Yeah, the ace/generic thing is such a weird argument. I'd have to really think about it to tell you what the frequency of occurrence is between unique and generics was in my last game, it's such a trivial distinction. Like... Why does it matter? Yeah, 1:1 an ace is stronger than its corresponding generic. It's also way more expensive.
In fleets that are all about maximizing a few squadrons--Adar, Yavaris, Jendon, etc--yeah, aces are great. But generics are way more efficient to exploit auras like Howlrunner, Norra, TF, Biggs, BCC, etc. Both have a place, both show up, and generic-heavy squadrons have performed just fine.
I don't know, it's just such a weird complaint. What is the down side even if unique were disproportionately represented?