+1, I think this is a step in the right direction. One other consideration I wanted to bring up was dependabot and if there's any unique handling we want to do there because I've noticed that PRs from dependabot tend to pile up. I think with the proposal we won't really need to do anything unique and just treat it as a normal PR (it would be a build label with its own set of reviewers) and we'll get notified the same way.
I'll also say for reviews (speaking for myself, but I think many others probably feel this way as well), always feel free to ping on Slack and follow up :) But overall I do like having more of a mechanism.
