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Sorta, kinda. One big example of when you wouldn't use Tokio is when you don't have an operating system.

Tokio is a good, default choice, but some projects may have different needs.

There are systems that for various reasons can't use Tokio. In my own projects, I know there are people who need things to be generic across any executor implementation, as they can't use Tokio.

Tokio itself is great though, so if you have no strong reason not to use it, I'd recommend it.

If you need less abstractions over protocols, you might look into [mio](https://github.com/carllerche/mio).