[tln]

I have no experience with monorepos - but yes, developers have to look over PRs that touch apps. No committing to the main branch!

Also what I have found to be essential to enable technical non-coders (and juniors! and contractors!) is that PR reviewers are responsible for merging and any needed final quality tweaks.

This isn't going to work with every team. Monorepos would make this whole effort harder, I'd guess that just teaching people what to edit would be painful.