no way anyone has 12 "projects" that are even worth working on. No one at any company is working on 12 things at the same time.
I guarantee they're just starting a bunch of half baked random projects, abandoning them half way through and starting 12 new ones.
It's less 12 projects and more 1 project + 11 changes/experiments. Complex projects still get the most attention, but I do a lot more work which may end up being discarded, and agents pick up any tasks which would've otherwise landed in the backlog. Update dependencies here, rebase this branch, start working on this issue, change this and benchmark it, etc.
They're probably calling things projects that most of us would call tasks or minor features.
I had 21 paralell projects in 2019: https://milic.info/projects (all in production).
Less then half were daily projects, others ocassionally.