The dominance of x86 PCs, which are Microsoft's bread and butter (the "Wintel" platform), is fading, as more people are using ARM devices as their main or only

The dominance of x86 PCs, which are Microsoft's bread and butter (the "Wintel" platform), is fading, as more people are using ARM devices as their main or only computing device. Arguably. I think that's what they meant, anyway.