What is the downside of setting PANTS_CONCURRENT=True? This is coming up for our team because we often have a pants command running (list tests) while also trying to commit code (which uses pants for pre-commit hooks). Allowing concurrent runs would unblock this pattern, but I can't figure out what would break.

Downside is you get less memoization - things will be slower with it permanently set

Allowing concurrent runs would unblock this pattern,

+1. If you haven't yet, may want to subscribe https://github.com/pantsbuild/pants/issues/7654 Also I think we're starting to think about the roadmap for Q1 2022, which will be a community survey where you can vote on things like prioritizing this