The problem with this is embrace extend extinguish. The way Microsoft adds features to email that only work well in their ecosystem and annoy everyone else is a clear extend phase in progress

Yeah that's why I didn't quite welcomed the feature at first: that's just MS adding their stuff and not following a standard.

Google is trying a similar strategy with AMP for email[1]. I think we're going to miss interoperable email once it's gone.

[1] https://developers.google.com/workspace/gmail/ampemail