“send a patch via mail” process.
I don’t see a problem with it. I don’t know what tools you use, but the current process certainly isn’t ancient. Even if I use GitHub or something else, I still highly depend on my e-mail to actually know somebody published a patch and if I am supposed to review it. I don’t have to use a GUI coupled with shitty UI decisions. E-mails are very simple in their own way and I don’t find it ancient or bad.
I love it too. It’s pretty much Gruvbox.