That's the kind of circular logic that has made third party publishers lose ground in the Japanese market over the years.
1. Put games on PS.
The cherry on top is that Switch is supposed to prove itself when it's not even being given a chance to do so in most cases.
But that mindset is what makes the Japanese sales charts so much fun to follow. PS and Xbox get trounced and third parties tie their fates to those consoles, so Nintendo dominates Japan not just as a hardware manufacturer, but also as a software publisher.
Then again, the PS4 is approaching its end and supporting the PS5 is dangerous because the previous three PS consoles (PS3, PSV, PS4) all stumbled out of the gate. Quite a few third party publishers will be forced to reconsider their approach and do day and date launches of their games, so the circular logic can't be used forever.
Have the other two points: Myopia generation and forget the handheld market.
1. The Myopia Generation
Only one or two generations are counted. Forget the other generations when Nintendo has the lead and has plenty of third parties support. And Third-party games sell well on Nintendo consoles.
2. Forget the handheld market
The handheld market is dominated by Nintendo. Nintendo never loses in the realm of the handheld market. DS, 3DS have strong third-party support because of this. The switch is a hybrid system, i guess a big chunk of that support going to Switch.