This is because using raw would be the same, right?

Using raw doesn't has anything to do with any change of this PR, so I'm not sure what you're referring to.

Mmm... I mean, raw plus the fact that a file descriptor is non-blocking by default would achieve the same thing as the old read_nonblock? I'm confused because I don't know what was the purpose of read_nonblock, maybe it had sense before we turned everything non-block by default?

I guess so yeah. raw simply affects how the terminal communicates to our process, not how the IO behaves, so it has nothing to do with that.