I see the only jump in plane functionality is needed when going from F3A P to F3A F/Unknowns. Many of the recent F3A designs are actually harder to fly for many AMA pilots, but it's the cool factor that counts. I've heard of trainers beating out 2M pattern planes in Sportsman and I've even flown my Super Cessna to a 3rd place in Advanced once against 2M planes. I've watched a 50 size Wind S win Masters against 2M planes and flown/shared my 50 sized Era in F3A. I think even classic birds are competitive in the AMA classes, easily through Advanced (Double stall turn, that's classic right lol) and even Masters to a certain extent. Nothing wrong with the Venus, Sequence, Osiris, Vanquish, Wind.... are all great AMA planes, but without proper practice even an Axiome+ won't make you a winner.

IMO I think it will take some purpose built planes for the F3A F/Unk's to be flown easily, and that most likely won't translate into planes that are easily flown in AMA classes.