Good for you, your circumstances lined up in such a way as for you to already have a PSN account through the console you own. But the issues you are ignoring are as follows:
it is predatory to impose such a major change (and, yes, it is major) on people AFTER they have purchased the game. The ease of creating a PSN account is an utterly moot point, a paying customer should not be forced to suffer changes to a thing they, supposedly, already owned, let alone a change which basically reduces the options to “you either give us your information, or you don’t play the game ON WHICH YOU ALREADY SPENT MONEY.”
the more accounts you have nowadays, the more your personal data is sold around. In addition, it’s a clear demonstration of encroachment by corporations who really should have no business forcing you to sign up to their shitty platforms.
it’s an extra layer of DRM, and DRM is exclusively a bad thing however you cut it (DRM means you don’t actually own the thing you friggin’ bought).
fuck Sony and their atrocious greed. Pure and simple.