If you are new, apart from a completely dead module, how would you know if a module wasn't working properly? With a new module, you at least have the chance to return and exchange it for a working one (if bought from a dealer). With a used module, if you discover it isn't working right after a week... two weeks... then what?
As I said, most used aren't significantly cheaper than new ones. So my advice for someone who is new to Eurorack is to not buy used modules until you feel comfortable IN Eurorack. I realized you quoted me verbatim. But you have to read it in the context of advice to someone who is NEW to Eurorack.