[gibolt]

Is there not a config for minimum supported JS version? That would appease everyone, while maintaining backwards compatibility.

Docs should show the recommended version (modern) and show what options are available to go deeper.

Obviously adding those settings for every pollyfill in non-trivial, but burdening everyone with every pollyfill ever is also suboptimal. If anything, this would make cleanup easier going forward since it would all be classified

[arthur2e5]

There is an "engine"!entry in package.json, and a package manager should be smart enough to not upgrade past what it can. But people tend to not use that sort of dependency flexibility and use lock files…