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HDDs are a lot more complicated with a ton of components and moving parts. You can measure and predict the wear on the disks, but not really anything else. Parts like the main motor, read head, secondary motor can fail suddenly. Theres also other stuff that wears down like springs, bearings, ribbon cables, lubricant, etc. The logic board on HDDs are also super complicated, since it has to do a lot. It has to control the brushless DC motor, which requires a complicated driver, control the read head motor, and a ton of other stuff. look online and compare the logic board of an HDD to an NVME and it's a miracle HDDs stayed relevant for so long.
It comes down to simplicity, SSDs just have so many fewer components that can break.