Another differentiating factor is the wavy red underline for misspelled words, with the implied meaning that unless you choose the right words, a diplomatic email could result in rivers of blood, or red ink. Being a metal head, I prefer the former, since a passionless life is the death of a million paper cutes.
Oh, there were a bunch of things like this.
For example, in Teams, you can type an at sign and then start someone's name and it will autocomplete their full name so you sound like an angry parent scolding a child. But, you can hit backspace. So someone wanting to address me as David does @Dav{tab}{backspace}.
But a lot of other cultures have very different conventions for names. Indian ones are a staggeringly bad fit for this, which is surprising for a company whose CEO is Indian. There's no way of both notifying an person and using their preferred form of address for a huge number of cases.
@david_chisnall @ashwin @Dav fun tidbit: telegram found an even worse way of handling similar mentions. there, when you forward a message from someone, the name of that account in your local contact list, not its profile name, is copied to the message and will be displayed in the message for all recipients. cue my wife forwarding a private message from me to a large group with my name displaying to everyone as something along the lines of “sweet little cutie pie” 🤣