I think the interest in dynamic errors (which is what most of the error libraries deal with) comes from (1) people learning Rust and trying to get them to do so

I think the interest in dynamic errors (which is what most of the error libraries deal with) comes from (1) people learning Rust and trying to get them to do something besides `unwrap`, (2) people prototyping and not wanting to use `unwrap`, and (3) applications where a lot of errors you just want to bubble up with some context.