I sympathise with this, and a lot of teams do operate that way, but I fundamentally disagree with it.

Part of the reason Amazon's CoE-driven engineer culture had such operation excellence is that the responsibility was driven the whole way up the management chain. If your manager didn't dig down to the root cause of a sev2, the director was damn well going to, and if the director didn't, Andy Jassy was going to call them on it.

That sounds like a lot of busy work, and a bunch of it undoubtedly is, but the flip side of it is that the actual root causes were addressed, and if the root cause needed serious cross-functional resources to address, the escalation would get you what you needed. Need approval to bounce 3 months of work off your roadmap to address? You have a VP on the line to make that call. Need a couple of other teams to fix their shit? Here's a principal engineer who outranks their directors to drive the work. And so on...