Flat spots certainly make for a less than pleasant driving experience, and probably not the safest tires to use, but dried out, old tires are another thing- they're plain and simple dangerous. When tires get old, the chemicals in the rubber that allows for resilience and flexibility wear out. Old tires also lose their road-gripping potential. Of course sun, heat and other elements hasten the degenerative process, but time is the main reason why old tires become ticking time bombs.
If someone feels comfortable using that "new-looking" tire in the shed, then go for it.
Cheers, gentlemen.
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