slog VS async

I only recently learned about rustwide myself when implementing sandboxed rustdoc builds for Shipyard.rs. After spending a good amount of time with the codebase, I have found it to be generally high quality, but the way the code is organized makes it fairly difficult to adapt for different purposes than it was intended for (not modular). I have a fork that I have changed to do what I need but not sure whether the two codebases can be reconciled because I ended up needing to put stuff very specific to my purposes in there. I also ran into a weird issue where the logging from rustwide was conflicting with the slog-based logging from my code, which feels to me like there is some UB lurking somewhere.

Slog Core Crate : core package to the gateway of logging modules.

I get the impression most of the time people are doing their Rust logging in the business thread, as opposed to using something like slog-async. For example, this repo only has 18 stars, whilst slog has 1.1k stars. Is it right to draw the conclusion that logging in a separate thread using an mpsc channel or something isn't typically a good idea?