i cant imagine that i am the only one, maybe the only one complaining, as my hands slipped off them grinding up a hill.
The grips are rubber. Rubber is typically selected for its adhesive and elastic properties. My TriTip grips move quite freely also - but they only move as much as I force them to. That degree of mobility enables their function. The most likely alternative would be hard molded grips (IMO a lesser design) - which you can find on most competing brands. If your hands physically slip off of the grips, then I suspect the problem has more to do with the way you’re handling the bar than the construction/design of the handgrips.