Yes. There has to be some way to allow a little wiggle room for high RPM operation, due to the lifters wanting to "take off" off of the peaks of the lobes as they go by. A sort of shock absorber for the valve train. The lash in a solid lifter valve train acts in the same way, but there's no hydraulic function to have to bleed down, so they can RPM higher and make more power due to the more aggressive ramps they are able to handle as a result.
