I'm experimenting with moving to Zen, but finding it frustrating. I think I can get around the containers-vs-workspaces-as-separate-things shift, but the last time I tried it I found it really opinionated and you lose a lot of the customization benefits of something like Firefox because it's so different.

It's seriously annoying because Arc has been just perfect for the kind of "keep each hat separate" workflows I have going. SigmaOS is the closest other thing I've used to it, but its reliance on a weird amalgam of the Safari and Chromium engines makes it behave really oddly with plugins like 1Password.