I don't participate in any mailing lists since at least 2008 and I'm pretty sophisticated. What constitutes "works" is that they (Linux Kernel working group) have a very primitive forum (mailing list) wherein there is no recognized pressure to change. People still use HAM radio because they "work" but that's not the optimal way to collaborate.

Give it a few more decades.

Does it? I find it really cumbersome. We were just interacting with it the other day and found it annoyingly baroque. There's a lot of assumed knowledge and I've read a fair bit of documentation and have been following Kernel development since before my career.

It "works" for the people who it works for and that's it.