also thiserror isn't incompatible with io::Error? all thiserror does is do code generation for "typical" enum errors. The errors it generates are normal rust code though, and the fact that they're generated by thiserror shouldn't really matter?
I don't get where the idea comes from that the popular error crates make error handling complicated in Rust. Because you're right, all thiserror is doing is giving you a shorter syntax for writing error enums. You could write the exact same things out by hand if you wanted to, and from the library user's side nothing would change.
As for anyhow, if a library ever exposes that, then that's just the author being lazy and not doing errors correctly. It's the equivalent of doing throw Exception("error!") in C#.
