Its shocking to me how heavy GM's electric trucks are. I'm also impressed with how much lighter nearly every Tesla is. I think that's the benefit of spartan interiors and "cheap" materials(though I don't think it feels cheap in my opinion). My Model Y Performance weighs in at 4,400lbs and the RWD Model 3 is 3,800lbs.
It's a function mainly of steel V aluminum in the frames and battery cradles, and how many parts overall.
The spartan interiors save some but nothing like the rest of the formula.