Weird omission of some clients like Thunderbird from the list.
I don’t think you’re going to get many people switching from mail.google.com to something in a terminal emulator straight away.
> These clients all compose plain text emails by default, with correct quoting and text wrapping settings, requiring no additional configuration to use correctly.
Thunderbird is not in the list because it requires configuration.
The recommended list includes several GUIs and web clients.
I have no idea what "sr.ht" is.
sr.ht is the software forge this plain text email website is set up to promote.
* https://sylpheed.sraoss.jp/en/download.html
Compare those to https://www.thunderbird.net/en-US/thunderbird/all
I can't find a current download for modern macOS on either of the first two
Really shouldn't need to explain that, IMO.
It runs everywhere and can be installed by anyone.
Why do want to make it harder for people?
If that’s not gatekeeping I don’t know what to tell you.