HK paid attention to the grip geometry on the SFP9 and VP9 — many shooters find the factory ergonomics work well without modification. In competition, working well is still a baseline. Aftermarket grips refine the texture and the thumb reference point, giving your hand a surface that holds more consistently under sustained fire and a position it finds the same way on every draw. The difference between "approximately the same grip" and "exactly the same grip" accumulates over a stage and compounds over a training cycle.
