It's also a SOCKS proxy, which at least the last time I used Tor standalone (where I'd have to configure it myself, as opposed to as part of TBB or TAILS where it's set up for me) was the main way a client would access the network.
I’m not in the slightest bit surprised you are being downvoted — your comment is overly dramatic and not a remotely useful contribution. The title of the post of “An implementation of Tor in Rust”. The project claims to be an implementation of Tor, which it is, and it claims to be written in Rust, which it is. It doesn’t claim to be a standalone replacement, it doesn’t claim to be finished and it doesn’t claim to be not-a-library.
I think the downvotes were for an very emotional claim ("infuriating") backed up by 0 arguments. Although it is weird to me that the actual explanation got downvoted instead of the original claim