Yes, the topic of arms-length vs IP sharing in a global setting would be a fascinating discussion we should have!

But after opining there should be separation, instead of arguing the merits of that plan, GP uses a personality characterization instead, leaving the comment lacking support.

IMO the level of seperation between Tesla and SpaceX is both material and heavily influenced by Elon Musk's decisions here. They aren't saying something like "Elon Musk is a narcissist so we should assume he'll give CCP access". That would be an ad-hominid.