As a non-committer, I want to make a plea for non-committer approval reviews, or at least that they have a place. When asked how outsiders can contribute I frequently see "review open PRs" as a suggested way of contributing to CPython. Not being able to approve PRs that are good would be a barrier to those contributions.
Furthermore, I am collaborating with a couple of core devs, it would make collaboration more difficult if I couldn't review their work and say that I thought the changes looked good.
I know "drive by approvals" are annoying but I think it is unfortunately part of open source projects.