I don't think that they do, so I'm confused on why this is an issue now other than shitty internet people that need something to complain about.
I think the big issue that nobody has thought about is moderation of the online experience, if you are playing online and "PS player" starts seriously harassing "Xbox player", how does that get resolved? What happens when two players have the same account name? Sony already has problems dealing with account names within their own system, I seriously doubt they have a way of dealing with that.
Sony has also had some serious network breaches that compromised customer data in the past, I can understand why they would want to keep their network as tight as possible.
Really the only thing I know that Sony has absolutely done wrong is locking players epic accounts up, that's undeniably shitty, seems to me that Epic should have a way to flag an account so that platforms can choose to recognize only natively purchased upgrades or not and that would solve the issue.
I don't really like episodic releases and I tend to wait until all episodes are out before buying; That said Hitman is different specifically because I don't have plans to play it but I did enjoy all the site content based on the first game which was really driven by it's episodic release.