Nintendo saw the oportunity to merge both of its markets (handheld where they absolutely dominated) into one system and created this hybrid console that became a mega-hit, in the case of the PC market, they just see these handhelds for what they are, add-ons at best, not a core HW needed, a nice thing to have but nothing else, that's why the Deck is selling like what? 5-6M to this day? Want me to be generous, I'll double it, 12M, it's nothing in comparison to the actual PC audience and the other options probably can't crack 5M combined
This idea that Handhelds are the priority just because the SW2 is selling like hotcakes won't transfer to other brands, we saw this happening with waggle-waggle motion controls, first come, first served, Nintendo dominated it and everyone else was wasting time and money trying to replicate it with lame ass results