I have not been in the cybertruck interior but assume it's very similar to my Y, which I love. I've owned Lexus LX's for years and also have a 2023 Yukon XL Denali. Tesla interior aesthetic is definitely minimalist and lower cost feeling, but it is more than sufficient. Personally, I don't love huge "burled walnut ;)" plastic panels and excessively large, contrasted double stitching.
"Barely useable as a truck" not sure what you mean, definitely not a good long hauler but it will definitely tow and it has a bed.
To call it grift, people know what they're getting when they purchase it, no?
Given that 301 stainless is cheaper than 304 or 316, which have similar mechanical properties while having better rust resistance, I would guess that material costs resulted in choosing 301 for the cybertruck.
My metallurgy is a bit rusty (sorry), so take this with a grain of salt (which 301 does not resist well, incidentally!).