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Magnetic platters absolutely do break down from sitting around. Bearings and other mechanics can also go bad. For those things, a professional recovery operation could still get the data if you’re willing to pay, but the drive itself should be thrown out.
Edit: keep in mind that with bit rot, the drive may superficially function just fine. Your data may even be 99% correct. That 1%, however, could cause unrecoverable problems, such as videos that glitch in the middle.
Maybe because you way overestimate the reliability of old drives. Yes, 10 year old drives can work. Doesn’t mean you should trust them with anything other than getting the data off of it.