It will only be a game changer if its dimensions are true 1:1 gen spec. But that would mean:
1: Straight drop in to both vintage and modern cases designed for gen movement (Yuki/J&W/Phong) ergo no movement spacer needed (yay!).
2: Gen dial and hands without modifications
3: Stem height issues with Rolex reps for crown position would be fixed
4: No more wokky rehauts due to gen dial size
But would also mean:
1: Current rep dials and hands meant for 21j/ETA would no longer fit
2: Low availability of movement parts if there is issues
3: ehm, struggling for negatives actually
