A console wants a competitive GPU and a competitive CPU. Nvidia has the first, Intel has the second, AMD has both. The first one is more important, hence the Switch, and AMD's ability to do it in the pre-Ryzen era. (The original Intel-CPU Xbox had an Nvidia GPU.) Console vendors are high volume institutional buyers with aggressive price targets, so being able to get both from the same place is a big advantage.

For PCs, discrete GPUs are getting bought separately so that doesn't apply. AMD does alright there but they were historically the underdog and highly budget-constrained, so without some kind of separate advantage they were struggling.

Now they're making a lot of money from Ryzen/Epyc and GPUs, and reinvesting most of it, so it's plausible they'll be more competitive going forward as the fruits of those investments come to bear.