As others have said, new pots have most likely been fitted because the old ones were knackered. Things wear out on basses: strings, pots, frets, even nuts can just split and break. Repair or chuck out? You know the answer to that. Another thought, if things have worn out, it means it’s been played - a lot, which means it’s a good one, otherwise it would be a case queen. Enjoy your new acquisition and don’t let the little things bother you.