Which is honestly not a bad idea, given that somebody shoulder surfing or trying to read smudges on the PIN pad becomes much easier in the case of repeated numb

Which is honestly not a bad idea, given that somebody shoulder surfing or trying to read smudges on the PIN pad becomes much easier in the case of repeated numbers. "1111" would just leave a fingerprint on a single key, for example, and only one possible PIN (or maybe 3, if the bank/card allows 6 digit PINs).