I've never talked to someone who was worried about 100 watts give or take in a desktop. The 100 watt difference, if you ran 24/7 is about 26 cents a day. A laptop would be a different story, of course, but these aren't laptops.

As for the footprint, it's usually not enough of a concern at the desktop to double or triple the price to go from a standard mini ATX down to a double height Mac Mini, but I'm sure there are some locations where that would be a concern.

No one outside of SF, Tokyo, & NYC cares about saving power or space for desktops which is why people panned the old garbage can pro. This is a slightly better direction, but I’m still waiting for a slightly more affordable bigger box Mac that isn’t an exorbitant Mac Pro. The old refrigerator models were reasonable. I don’t want an improved Mac garbage can model

I work from home in a 1 bedroom in NYC and a normal sized desktop works just fine under my standing desk with dual monitors here. Even if my PC were Mac Studio sized, I'd have it under my desk to maximize desk space.

I really wonder how many people actually care about saving space with desktops at the expense of everything else.