When Chrysler was developing the G3 they consulted with Tom Hoover on the design. He recommended raising the cam in the block to improve geometry. Too bad the father of the Hemi isn't around anymore to ask his opinion.
Hmmm......who to trust? Mr. Hoover or King of the dirty low buck 318?
If there is something inherently wrong with lifter lubrication, it would probably entail a drastic revision and an admittance of guilt. Not good when there are millions out there. I have to believe FCA knows why they are failing. So far, they seem to be remaining silent except for now using "hellcat" lifters in ALL engines.