For some products this makes sense, because Edge has made some questionable choices to either not support some standards, or have their own flavor of them (see WebRTC).

No offense, but I won't support Edge on some stuff I build because very few people use it, and it's too much of a snowflake in some areas.

Note that this doesn't apply to general apps and sites, which should work with Edge more or less out of the box. I'm speaking specifically to cases where the Edge team has decided to ignore a standard and choose their business priorities over consistency.