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which is greatly exaggerated, as it's not constant use that decreases the lifespan, it's disjointed cooldown and heatup. If you leave a card on 24/7 theres not much of a heat gradient in regard to time. Is it getting stress? Sure. Is it killing the card? Not really.

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The ramp up and down is more important than cumulative heat exposure for solid state components, but not for moving parts in the cooling system, and also electrolytic capacitors age much faster in a hot environment.

Miners usually underclock their cards to get higher efficiency out of them. Fans are very easily replaceable.

All use stresses the card, whether constant or periodic usage.

I'd still rather buy a card that has been used 2 hours a day for gaming than 24 hours for mining.

I'm not so sure about that. Mining cards are often undervolted to run at cooler temperatures and consume less power, while gaming cards are pushed to 100% and might even be overclocked. The fans might become problematic, but i think overall a mining card receives less stress in its lifetime

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