Speaking out of my ass here, but I would not be surprised if it's much cheaper to paint cheap stamped steel, compared to using more expensive stainless steel that's treated to remove all surface marring/scarring from the stamping process. Those panels don't come out all brushed from the metal presses...

Stainless steel is far harder to work than regular steel. There is no way that process was cheaper.

What happens if you scrape your fridge getting it into the kitchen?

You go to the DIY shop and buy a tin of white spray paint.

What happens if you scrape your brushed stainless fridge getting it into the kitchen?

Well, now you get to either live with it, or come up with some really clever ideas on polishing out the scratch and then sanding it back to disguise it with the rest of the surface which will never really look right.

Stainless would be standard on economy cars, and the Cybertruck would be painted so as not to look like a Ford Pinto.