I’m not sure this flat tappet nightmare is ever going to get corrected. There might be some improvement in the super common, higher volume, engines like SBC, BBC, SBF. I know Comp had released some stuff with DLC coating.
Hydraulic lifters cant be trusted either. My friend just had his total restoration job on a '72 Blazer with a 350 self destruct the top end in about 40 minutes when the hydraulic lifters failed.
Summit sent him a new roller cam set lifters, etc totalling over $3500. So far, so good on the new higher end parts.
They obviously were aware of the problem because they barely put up a fuss over the claim.
