Just because you can compile something for a platform doesn't mean you should

[Labster]

Typical El Reg sensationalism. Everyone I have talked to about C#/.NET says it’s a good language. And with Mono, you can run it on Posixes too. But like ObjC or Swift, it suffers from being oriented towards a single platform.

Windows’ extreme level of backcompat means that you can play DOS games today, even with Wine on Macs. The reverse is not at all true in the Mac world, where a significant amount of OS X code will no longer run on OS X - mainly 32-bit Carbon apps.