It's literally their job to keep their consoles safe, this is not just about piracy. A vulnerable console could do all kinds of stuff users don't want.
Then also piracy: The game industry is already struggling, good luck explaining that one of the rare non live service offline single player games (after all those are the games most hurt by piracy), which has been in development for years, didn't sell because you left a disclosed exploit wide open and now everyone loses their jobs.
It is just about piracy. Sony's repeatedly demonstrated they don't care about their users' safety (see: numerous high profile data leaks), and these bootloader exploits aren't the sort of thing a virus can exploit.
Sony is totally in their right to act this way, it makes business sense for them, and I would do the same in their position. Customers do benefit e.g. from working anti-cheat, subsidized consoles, offline play etc.
But does that mean I have to like it? No, of course not!
Would I prefer to have root on my own machines to do whatever I want with them, knowing that it conflicts with other people's interests? Sure.
I guess my point is: If you treat the status quo as a fact of nature, non-negotiable, then you direct your anger at your peers. You can't change Sony or how society works, but you can yell at people on X. If you realize Sony is also just people and everything is in principle negotiable, then... well it is actually pretty silly that there are some people spending a lot of time building these baroque ultra-secure systems, and other people spending a lot of time cracking them (and bickering with each other) - where they could all just, I don't know, not do that.
It's literally their job to keep their consoles safe, this is not just about piracy. A vulnerable console could do all kinds of stuff users don't want.
Then also piracy: The game industry is already struggling, good luck explaining that one of the rare non live service offline single player games (after all those are the games most hurt by piracy), which has been in development for years, didn't sell because you left a disclosed exploit wide open and now everyone loses their jobs.