Node shrinkening slowed down significantly from that time period, series s is on 7nm node already, bro, switch2 being on tnmsc 6nm(not even 3nm like apple phones) wont make it crazy more power efficient unfortunately.
Believe me, i want switch 2 to be as powerful as possible, hell i would gladly give up on handheld mode just so docked is comparable to series x/base ps5, but cant be helped, physics is a nasty cold biatch
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U can see it in my post u quoted, compare ps5base vs slim version, slim has higher powerdraw, precisely coz node shrinking slowed down big time, unlike how it was durning 7th gen console lifecycle.
Another example, and here i give u direct nvidia comparision, rumored(but basically certain) to be revealed in few days rtx 5090, new nvidia flagship gpu is supposed to have 600W powerdraw, im sure if nvidia could they wouldnt go above 450W like with 4090 but guess what- node shrinking got so slow that they need to make their new graphics card humongous both chip size and powerdraw to even have mild (30% improvement in raster most likely on avg) vs their previous BiS card.
Last comparision, just so u know how nasty it got, xbox 360, the launch model, was made on 90nm process node, ofc switch was faster and much more energy efficient, it was made on 20nm node after all