Stainless, Bushed PRW Rocker Arms

Makes sense to me too.
Although I have a set of factory 273 rocker arms and shafts that came with banana grooves and a solid cam.
Like you said a hydraulic cam is always loaded, that extra oil groove has got to help.
I think they are a good idea with Hyd. Or Solid.
Unless I'm missing something
I don't see a down side.
The only down side would be that PRW doesn't use gooves on their shaft necessitating the expense of purchasing shafts that do have grooves.
And of course when you do this, it gives them the right to deny any potential warranty claims because you didn't use their shafts.