Lotus did this on their chassis not because it was cheap, but because it allowed them to use lighter, thinner aluminum which would have been ruined by welding. It was almost certainly not cheaper than welding, they had to add little protrusions that kept all the pieces 0.2mm apart, which is what made for the best bonding. They went to a lot of trouble to make this process work, and it resulted in one of the best sports cars of all time in terms of pure driving experience.

Tesla has very different reasons for doing what they did on the cybertruck. It's very much a form over function. Lotus has always been function over form (to a fault, in terms of their financial position).