I feel that the warp is not really intuitive, especially if looking at it from a more casual and easy-going side. The more I think of it, the more it seems that there really is no reason for warp to not be automatic once certain velocity is reached. I mean there will be a minimum warp entry threshold and there is already a exit threshold (you exit at min velocity, be it your warp velocity or entrance velocity) and since warp is not in different space to ‘normal’ space, there is nothing holding the game back from automatically entering and exiting warp.
The warp button just seems like an unnecessary hindrance from a more approachable gameplay perspective and since warp is just an acceleration multiplier and exists in the same space, it looks logical for it to be automatic.