Earlier quoted context omitted.
The industry would do well to better absorb the underlying point here (seriously, people, if Emeralds on Trails was really that great of an abstraction, a decent QIQ programmer with Orchestra framework experience would probably be able to pick up the important bits in the time an Emerald dev would be learning the domain specific portions of the app). But unfortunately, there are still costs to switching platforms and…
Apple released a Linux port of Swift and its standard library when they open sourced it[0], indicating they are neither indifferent nor outright hostile to the language running on other platforms outside their ecosystem. [0]: https://swift.org/blog/swift-linux-port/
As it is, even after NeXT had started down a cross-platform development road, Apple made several decisions that were indifferent to it (and a few that were hostile). Why will Swift be different?