Perhaps not to you but to me it matters a lot.
I live in a country where it gets very hot in the summer. I prefer to keep my environment cool without needing AC. Unfortunately I have found that is not possible to do with my beefy Dell workstation that consumes in the 1kW range thanks to the Intel CPU and Nvidia GPU.
It isn't just a feeling but a hard fact that my thermostat can confirm that running my Intel workstation puts my office up to uncomfortable temps. No such thing happens with my M1 Ultra Mac Studio running with a third to a quarter less power consumption.
Perhaps I am alone in this but I dislike having to use AC to cool my office when I can just not make it so damn hot in the first place. It is all just a waste of energy and energy isn't free.
If it's not an issue for you then fair enough buy a 1kW+ Intel/Nvidia system but to say "it makes fuckall difference on a workstation" is disingenuous.