Why is this not more popular? Coconut seems like something many people, including me, would want to use for every Python project of sufficient complexity. What's the catch?
1. You have to be OK with a compilation step that isn't part of the Python world.
2. To the best of my knowledge the language has been and still is being developed by a single person, so there's the "Evan gets hit by a bus" risk built in.
3. Tooling is virtually nonexistent. There's a Vim plugin that understands the language syntax but there's zero IDE support. Of course you can debug the generated Python with Pycharm/VS Code/etc and having done it I can say it's not terribly painful but isn't terribly fun either.
I think that over time the lack of tooling will be the biggest hindrance to the language's further adoption. OTOH I'd be curious to know if this has been a major factor in other unpopular languages remaining unpopular. I seem to remember a lot of complaints about tooling in the early days of Scala but the language still managed to become fairly successful once that situation improved.
Edit: formatting, final thoughts