i benefited from it straight off, posture and control was loads better. im not a world class uci level rider...
leave it a few days your wrists will get used to it, i hated it at first but its wrong to leave an opinion after just a ride, leave it at least a week and your wrist will adapt i would have thought, i can kinda see the sense in your ideas, but i dont think there will be a trials specific stem with that geometry. once you used to how the bike reacts with that bar angle i found it 100 x better, now it feels weird when bars are at "normal" angles and that the "carthy/gilles" angle feels second nature.