I don't see how your example contradicts my point of view. When you move things from a fairly popular system to a widely popular system, you expect it to work as well as before. Now instead if you had chosen an obscure system nobody cared about, of course you would have loved your tools would be supported as well - but hey, you knew that choice was risky.
Of course portability is pretty damn important : it gives you the liberty to choose the system you want (depending on your needs) while keeping the same user experience everywhere. But x86_64 Linux systems (for instance) should not be supported because they run Linux : they should be supported because a whole bunch of people use them and need that support.
Of course portability is pretty damn important : it gives you the liberty to choose the system you want (depending on your needs) while keeping the same user experience everywhere. But x86_64 Linux systems (for instance) should not be supported because they run Linux : they should be supported because a whole bunch of people use them and need that support.