Almost always, for one reason that has nothing to do with the structure: buyers discount an unrepaired foundation by far more than the repair costs, because they are pricing an unknown. A documented repair with a transferable warranty converts that unknown into a solved problem.
More detail
There are two separate questions inside this one and they have different answers. Is the structure at risk. That depends entirely on whether movement is active. A crack that has not changed across a full wet and dry cycle is a historical event, and monitoring it is a legitimate decision rather than negligence. A wall that is deflecting, or settlement that is progressing, is a different situation, and the cost of waiting is that the repair scope grows with the movement. Is the money worth spending. This is where the answer is clearer than most owners expect, and it is a market question rather than an engineering one. A buyer looking at visible foundation movement with no documentation cannot price it. They do not know if it is $4,000 or $40,000, so they either discount heavily, demand an inspection contingency and then negotiate from the result, or walk. In practice the discount applied to an unrepaired foundation regularly exceeds what the repair would have cost, and it comes off the sale price in a single line. What repair actually buys. Piers at $1,200 to $2,500 each installed, or reinforcement in the mid four figures, plus documentation: the engineer report, the scope, and a warranty that in this trade is frequently transferable. That package turns a question buyers cannot answer into one they can. It also removes the appraisal and financing risk that stalls closings, since lenders finance documented completed repairs and hesitate on active structural movement. When it is genuinely not worth it. When the movement is minor, stable, and cosmetic, and monitoring shows no change across a year. When the house is being sold as a teardown. And when a five-figure recommendation has not been checked by an independent structural engineer, which is the case worth pausing on rather than proceeding with. The encouraging part: Greater Cincinnati sits on glacial till over Ordovician limestone and shale, with clay-rich soils that hold water and hillside slopes that concentrate it. Movement is common enough in this market that buyers here are used to seeing repairs, and a documented one reads as maintenance rather than as a red flag.