Buying new is silly in most cases, though I am unsure how it works for EVs, or how to check if an EV is okay.
I have never had an overly fancy car, and have more worried about reliability as I needed it for work.
As some people point out though, when you buy used you are buying other people's problems. I've never quite noticed that before, but I can appreciate the logic.
I have bought mostly used cars, but as long as checking them okay prior, there hasn't been any major issues. However, I have no idea how to check an EV.