> Apple is already supporting Swift on other platforms, however, developer experience is not as good as on macOS and I don't think that can/will be solved by Apple

Yes it can. It's just Apple can't be bothered - most of the work to do that doesn't benefit Apple - it does benefit the Swift ecosystem and community of devs, but not Apple - the venn diagram of Apple vs the Swift dev community overlaps but doesn't completely close.

Swift came out in 2014 - Windows support for the compiler came out in 2020. That's it. They haven't bothered to upgrade the tooling support in VSCode or any other app because most VSCode users aren't Apple devs. The ball is literally in Apple's court - no one elses.