Solid Flat Tappet on Hydraulic Cam?

A hydro roller has no "entry ramp": its designed to open and close with no lash obviously. A mechanical has ramps on the lobe that slowly come up onto the lifter, then open it quickly and then set the valve back down, easing it onto the seat and then taper off to lash. If you could visualize the lobe as a hill, the mech would have a longer run up to the lift portion, while the hydro would just go right into it. If you put a hydro lifter on a mechanical cam, it would fully seat very late and start to open very soon in the cycle. Would probably burn a valve as the valve would not be on the seat for long at all.