NG subsystems PR: https://github.com/pantsbuild/pants/pull/23165 I could use feedback on the API here, as this will be a high-touch API for NG plugin authors

I've got a pile of PRs to review here, and not sure if you've written about it in this PR - but is there the intention or goal to go more for composability, in lieu of inheritance for these newer subsystems?

not sure I understand where composability vs inheritance comes in?