I had an argument with an IT professor I know regarding passwords and security. I was mad about my in-laws having a weak WPA1 protected router and the stock password while I insist on having WPA3 and a very strong passphrase.

Well, the discussion continued and later he said something to the point of “everything tries to guess your password, so I don’t have any where it is possible, because the programs don’t know what to do if there isn’t one“

What are your opinions about this?