I don't think anyone would say winning all the different GPs is some kind of game-changing achievement. Yuna never got invited to NHK... is that such a big deal? Winning the whole GP series is an interesting achievement, but it certainly doesn't define a skater. No one's going to say, "Mao Asada is greater than Yuna Kim because she has won all the different GPs."

No one's going to call Kavaguti/Smirnov (and I do like them) a greater Russian pair than Berezhnaya/Sikharulidze. No one's going to say Virtue/Moir or Michelle Kwan aren't true greats of the sport because of their GPs.
I wouldn't be against giving skaters the chance to choose, but imo, it's not a huge deal.