GOOD rockers w/ bearings have very good service life. I had a set of Harland Sharps on a 440 that were bought new in the mid 1990s and had been on solid roller cams all their life. Never had an issue w/ the bearings. Had to replace two due to flaking on the roller tip, but that's it.
I know of many others w/ the same experience as mine.
I'm not arguing for or against bushings...just saying the good bearings work very well.
If you buy cheap stuff, you have to expect failures.