* They descend on random design docs to demand changes, based on vague pattern matching to a problem they faced 5 years ago.
* They don't have to do any of the work to implement those changes, of course. My team has to, and we have to defer to their opinion that changes are needed.
* If the changes they demand end up being really dumb, and hurt or kill my project, they can't be held accountable. Not even when it's a recurring pattern, since every corporate metric will show that the project team are the ones who messed up.
Maybe our disagreement is less severe than I'm thinking, since I also wouldn't agree the IC model at e.g. Google works like you're describing. But separating accountability and responsibility is in my experience an unmitigated disaster.