Except... you don't. You seem to have zero actual technological knowledge and are just argueing for the sake of argueing.
Opening up your system like that, doesn't open you up to hackers or piracy at all. It's like you don't understand how hacking works.
You don't control the servers you don't control the security and since your psn account has to link you all it makes everything more vulnerable, increases exploits and leads to piracy it's a stupid idea on a closed system, on pc your accounts are seperate for each game
Question have you played on Steam before? Just wondering cause then you'd know that your post is just simply not true and well most of your posts would be negated if you knew anything about the service, cause it is both open AND allows you to have uniform name and account that saves all your achievements as well as having cross game voice chat, chat rooms, and the like, and able to use the web while in game... and yet I can still choose to use a custom server if I feel like it, hell Steam gives me the tools to operate one properly and I can use my PC to host, there really isn't any excuse to leave a service closed since I'm more likely to find hackers in game getting away with hacking in a console game than on private servers run by dedicated players.
No1 is going to host dedicated servers for consoles games which like you said is p2p in game and like I already pointed out having every company have their own servers for the waiting rooms and matchmaking or whatever is a bad idea
Except... the reasons you've pointed out were complete fiction and seemingly based on no understanding of how hackers work. Private servers don't open you up to hackers. You don't use servers to hack.
It doesn't open you up to piracy either. At best it allows people who do pirate, to play on pirated servers... but it doesn't make it any easier to pirate.
Nothing would change in sony's anti-piracy moves.
PSN does not control the security now. All of the verification software is done by each company independetly. There is literally no difference between the security on a PC game and a console game when it comes to hackers.