Scoped enums ("enum class") are a very small improvement on the previous enum, the main thing they deliver is that they don't pollute your namespace as badly thanks to the scoping.

Their notional status as "strict types" means nothing in a language which doesn't really care anyway, that's why memory_order::relaxed < cv_status::timeout is true

In Rust if you write nonsense like that it doesn't compile, these aren't comparable things. In C++ they're just integers, so of course you can see that relaxed (the integer zero) is less than timeout (the integer one) ...

They are just integers wearing funny hats.