I manage several open source projects under a single free CircleCI tier. The forced project filtering makes it really hard to track down why workflows aren't running.
e.g. I know that I can run up to 4 workflows at the same time, but I only see 2 running. So I have to filter by each project, one by one until I find the one that is running.
A default filter of 'all' would solve this for my team.