Desktop operating systems are increasingly irrelevant (to a first approximation). Windows is still very relevant, especially on servers, but even on corporate desktops; you just don't see a lot of Windows laptops at the sort of events and companies that most of the readers here are probably most familiar with. But it's not like most companies developing software for the largely Linux ecosystem are doing much desktop-specific investment either. Apple's a bit more complicated because they still want to sell Macs so their operating system can't get too bad--but it's only there to sell MacBooks.