> the only thing you can do to change things is to go ahead and try to change things.
You are describing taking risks and/or being penalized for little to no potential reward in most organizations.
You are doing something you are not asked to, so any inconvenience or side effect, whatever the cause is, is on you. And as it was not marketed internaly few people will be aware you did anything, accordingly you will get little recognition (financial or any).
It also presumes you already accomplished everything that was under your responsability, which is basically impossible in any org where objectives or KPIs are set so you hit a 80% target. You’ll then have to explain why you prioritized a seemingly random task, and bothered the other teams to help you do it without consulting your boss or their bosses.
Basically this approach could work for critical issues that are obvious they should be fixed. But then it should also be obvious to your boss, so getting their clearance is the normal way to do it.
This is I think the reason why people just leave instead of fighting a losing battle to fix issues they care about but the upper ranks don’t prioritize.