The tradeoff is price, not saleability. A home sold without cleanout or repair typically prices lower than a comparable, move-in-ready home, and the size of that gap depends on condition and what buyers in your price range expect walking in the door.
Selling as-is also saves real time and money on a downsizing timeline, since managing contractors, permits and a cleanout can add weeks you may not have. A well-priced as-is home often sells faster than an overpriced, freshly renovated one.
The right call depends on your timeline, your energy and whether the numbers actually favour fixing versus discounting. Get your hand-reviewed valuation from Joel Dyck.