Ive been using wacoms for over a decade. Im on my 7th and 8th stylus and they all feel the same. every single one i tried at the apple store when they had them in display and every one i used from school over the years feel the same. The nib has to be able to sink and pop out of the hole in order to work. The sinking aspect causes the most inaccuracies.
I checked mine, all 5 of my grip pens (I assume you are talking about the grip pens, I didn't check my other pens). They are all the original grip pens that came with my devices (Companion, 12, 22, 27, and Intuos 3) and non pop in and out. Unless the popping in and out is so slight (to me) that it's not registering in my mind. Which is possible.
I've never had accuracy issues in Ai, Wilcom or Blender. Nor in Ps, but I hardly use that program, those other 3, I spend the most time in. I'm always selecting and modifying anchor points in Ai and Wilcom. If that was inaccurate, I would be more then irritated.