Earlier quoted context omitted.
This is an expected normalization of html email I have two Macs running Microsoft Outlook. One is running a version several years behind the current one. The old machine can send e-mail as plain text. The one running the current Microsoft Outlook doesn't have that option, or a way to enable it that I've been able to find.
I recently changed to macOS, and macOS Outlook is a bit of a puzzle. On one hand an admission that the web app isn't good enough, on the other... It's not quite a proper port of the windows version? Thankfully i write mostly code and documentation - so far i don't have to care that 2023 Outlook is worse than 2003 Pine. On the other hand there's a shared calendar.
I don't think it's supposed to be.
At a big tech conference about ten years ago, a Microsoft exec said that new Office features are tried out on Macs before getting ported to Windows.
I don't know if that's still the strategy today, but it was around 2011.