Since i wrote from a more abstract perspective, a systemic perspective, i am looking in the perspective of Reducing the rate of consumption for computing, and i feel the electrical consumption factor is a case of missing the forest because we paid too much attention to the trees. Too many state and NGOs lean into that.
The actual math of concrete examples we can come up will not change the underlying fact that consumerism fueled by corporations will always trump over whatever perceived or real efficiency gains, and i do not agree it ''pays back relatively quickly'': even the favourable example of replacing an Xbox Original for a Steam Deck demanded at least 2000 hours for the electrical consumption to match the incorporated energy, but this still had to incorporate whatever is needed to reprocess the xbox as the new trash it became (recycling and discarting).
What will the math look like in the future ? because over time, the tinier processors demand more and more energy and resources to manufacture, over the older ones. How many hours of use will the (presumably) more eletricity efficient PS6 demand to offset the PS5 it will be set to replace ?
It does not matter if the Steam Deck, which is subsidized by Steam like almost all consoles and because of that it is cheaper for the end-consumer, consumes less electricity, it still made you pretty much discard a fully functional and capable computer and buy another one, a computer that will degrade with time and have less lifespan, that could have continued in use with a technically possible upgrade.
I feel a computing culture that sees normal to discard functional computers every 3-5 years because of minutiae like slightly less eletricity consumption or even more facial hair in characters will never really be sustainable. Eletricity consumption is being solved with renewable energy, hidro and nuclear , but the rate of material and natural resources consumption, and pollution, of non renowable stuff, is not being tackled.