I use two threaded mailers: Thunderbird and Mulberry. But the main value of threading here is being able to skip to the end of a subthread to see the latest answer. I can do that quickly in a forum without threading. But I do like the threading of Reddit and Slashdot, so a forum that supports that would be nice. My biggest gripe with the mailing  list is really with my ISP's mailing system (Xfinity), which doesn't retry a submission to the listserv when the listserv's greylisting bounces the initial submission with a temporary failure. I have to wait a couple minutes for the bounce email and then re-send from my Sent folder. As I'll certainly have to do with this message. So I don't participate as much on this list as I do on others without the greylisting. A forum wouldn't be subject to this problem. It does seem that forums get better search engine spidering than mailing list archives do. So it would be easier to search for answers using a forum. I'd hope to see a forum with a monthly or weekly mailing of a summary of active threads. I get that with a few forums, notably Rocky Linux and Visual Tool Kit. That's a feature of mailing lists: I don't forget to look to see new messages. But I do filter mailing list messages to separate folders (using the List-ID header) so they don't clutter my Inbox. I just glance at the Boost folder to see what new activity is available as part of my regular email regimen.