[shpx]

That's a lot more work than your library just working in more places.

[fiddlerwoaroof]

I don’t think it’s all that much more: basically every bundler I’ve used uses browserslist to include polyfills for the developer’s target audience.

But, also, I think this sort of easy path inflicts a huge cost on the ecosystem as a whole: writing to the standards and expecting your users to supply a compliant environment solves a lot of N*M problems in the dev process.