I replied thrice because I was surprised to read commenters replies as if Outlook introduced a new unheard-of feature. Including an interop related question I thought about later, because I still can’t understand why emojis involve loading images.
I found the thread too late to develop a well researched post and so commented as I read. Sorry if it offends your sensibilities. But why are you policing how I comment? :-)
Also, why Gmail is important: It’s a fairly major email provider so it sort of matters when they deployed this. Two market majors having a feature usually implies others will follow suit — eventually.
> is it supposed to be okay
This assumes so much. I’ll turn this around. Why’s it not okay? I can’t see any RFC that forbids this. It’s not a feature I’m interested in but I think it’s interesting that email is evolving to match what users are used to on Slack, Teams, WhatsApp etc. And (software) evolution is something I’m very interested in.