Doesn’t work for every use case, but perfect for mine. I was just pointing out other options.

Valid points. I use it for my media collection I can easily restore and won’t miss. Cache would be sort of nice to have and redundancy would just be wasting space.

Mergerfs can do that too and you can keep the underlying fs as whatever you want.

I think containers (that Firefox already has) are a much better way to handle this. Profiles, art least the way they are implemented on chrome, feels like a massive downgrade.