Stainless, Bushed PRW Rocker Arms

CRUZE 418 said

The PRW rockers are more or less a complete roller rocker kit. Mike doesn't do anything to them, he just adds a small correction kit for the geometry on the trick flow heads. So the kit is rockers, spacers and shims to center the rockers and non banana groove shafts.
I did not groove my shafts. It's been 3 or 4 years, not saying not to have that done, or get them.

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Mine aren't grooved either and my PRW rockers are going on 8-9 yrs or there abouts without an issue whatsoever. I was just asking because if it was so necessary as stated in post #52 by Rat Bastid, why are there so many folks who haven't had a problem running the stainless PRW rockers without grooved shafts (myself included)? And why does B3 sells them if grooved shafts were needed?