Could you, for a moment, imagine that others might feel like that about the command-line-plain-text-email-to-mailing-list workflows? Possibly not, as you have labelled them

> the kind of people who have little patience for technology problems and little patience for learning new things

Also tell me how is tolerating rude incumbents of mailing list sending email with 50+ characters in a line a technical problem? (Yes they are often rude, and unwelcoming to those attempting to accept their anachronistic ways. You are demonstrating that specific behaviour right here, which many of us have encountered on those projects.)

I think the projects which accept contributions only from mailing lists will have their contributors die out, or will be forced to change their ways to survive. I for one will never again attempt to contribute to such project, thanks to the inflexibility of the incumbents I have faced several times. Also thanks to the sub-par review workflow, usually the lacking quick CI feedback.

Web UI might give you RSI, but the insufferable email-only-patches people give me PTSD from my previous encounters.

ps: if you are willing to learn new things, you can automate web apps and GUI apps (eg. Autoit, xaut). Some even have proper APIs (COM/dbus/web api), or a cli!