Yeah, having hashes of substrings of a password would help a LOT when brute forcing. If I have a 10 char pass, and I'm storing 1 hash of the full pass + 9 hashe

Yeah, having hashes of substrings of a password would help a LOT when brute forcing. If I have a 10 char pass, and I'm storing 1 hash of the full pass + 9 hashes of the 2-char substrings, I can now brute force all those 2-char hashes and then fit them together in the few valid ways they could go together (assuming there is more than 1) until I find the final hash. Salts wouldn't matter.