Lane
Agree with your assessment but that could be the advancements in technology for better covers rather than the fact that an old cover would not create a sufficient amount of friction to be successful on that condition.
A true test would be to take a ball that is still in production from a few years ago and drill a new one. I understand Storm has made updates to the Hyroad cover over the years. Too bad because if they did not, if someone had one from 4-5 years ago brand new, undrilled, we could get a fresh one with similar specs, drill them as close to each other as possible, throw them on a spinner so they have the same finish, and then compare to see if a fresh pour creates any difference compared to the same ball poured years ago.