Using classic Outlook for Windows in business environments
I think what the multilingual community is asking for is to bring back the feature of defining with marking+right mouse click the language you are currently typing in (used to be a feature) - and of course the better alternative to automatic detect the language you are typing in ([from the shortlist you define] used to be a feature as well- that only sometimes needed to be overwritten with the right click mouse define language).
Hiding or disabling such functionality is frustrating to those that write multilingual emails (sometimes switching language between paragraphs). For us hard to understand how that's not a problem for everyone.