It's not Microsoft and Google's job to write Apple's software for them. It's like complaining that Apple doesn't write a good Dotnet runtime; of course they don't. It's not their job, and they don't want to anyways.
> It would be a completely new source of developers for these platforms.
I have no idea who you're referring to here. Who are the developers that are locked-in to iOS/MacOS but would consider ChromeOS or Windows if it supported Swift better? I cannot think of a single person I know that fills that bill. If anything it's the other way around, where people end up switching away because they don't have any use for Swift/AppleScript.
> It would be a completely new source of developers for these platforms.
I have no idea who you're referring to here. Who are the developers that are locked-in to iOS/MacOS but would consider ChromeOS or Windows if it supported Swift better? I cannot think of a single person I know that fills that bill. If anything it's the other way around, where people end up switching away because they don't have any use for Swift/AppleScript.