Funny, that, seeing how M$ themselves are perhaps the biggest contributors to the current browser codebase monoculture issue.
Anytime a software project develops enough complexity, there is no shame in targeting a specific platform. Given enough eyes on a thing, though, those kinds of "supported" issues always take care of themselves.
But I'm just a lone developer trying to do something never before done. I'm still trying to prove a concept...
I too am a lone developer but (not to judge) I consider any website I work on to only be complete if it works on Chrome and Firefox and maybe Edge. I mean, it's easily thousands of times easier to do this now than it was in the early 2000's when we were all forced to do IE5/6/7/8 compatibility, and the tooling wasn't remotely as good... so I won't have any sympathy for you LOL
Anytime a software project develops enough complexity, there is no shame in targeting a specific platform. Given enough eyes on a thing, though, those kinds of "supported" issues always take care of themselves.
But I'm just a lone developer trying to do something never before done. I'm still trying to prove a concept...