I guess many old website maintenance workflows still rely on ftp'ing HTML and assets to the web server (though not through browsers). I personally have recommended clients to switch over to ssh/scp 15 years ago if they can help it but their hosting package might not support it. The optimal, made-for-purpose protocol for this use case is WebDAV but I'm not sure it's still supported out-of-the-box by all major OSs and/or hosting packages.