Youtuber out of Canada named D and D Speed shop installed a Hyd flat tappet Thumper cam in a smogger 454 about 2 months ago. He just released a video of a ground to a pulp lifter.
https://www.youtube.com/watch?v=4WfDM-nonLQ I guess this answers my question. Around 12 years ago I had a friend put a Comp cam into a 440 and it lasted a whole 52 miles before failing like the one in the video. Maybe the bean counters think they'll sell more cams this way, sorry, that's not how it works.