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The issue is completely different if the users of an app or a website are customers. Then you have to make it work for them or you'll lose sales. If it's non-commercial project then it doesn't matter if it works with all browsers or not.

Why not only use features that are compatible with all browsers? You don’t need to use every bleeding edge feature to make a website.

I mostly do stick to baseline widely available, but once in awhile something can only be done with a niche API unless perhaps I include a 10 MiB, slow, clunky polyfill. And for a hobby site without paying users, I basically just don't care.

Can you name some examples? Are those APIs required for core functionality of your websites or are they limited to features that could be made optional?

Welcome to Microsoft world of IE.