Roller cam/lifter problem

So I am confused. What was said is that Flat Tappet makes more power? Then what was said is that more aggressive ramps are the reason.

First I assumed you meant Hyd flat tappet. So I guess @moper you were talking solids? But I thought even solid FT lifters could only go so fast on ramps without the edge digging into the cam. That rollers, solid or Hyd, could have more aggressive ramps than FT. So I am wrong? and a solid FT cam can be more aggressive ramps than a Roller?