While true for the component itself, there's material difference for any caps surrounding it. Sure the chipset would work fine at 40, 50, 70°C. However electrolytic capacitors lifespan is halved with every 10°C temperature increase. From a brief search it seems solid caps also crap out much faster at higher temps but can outlast electrolytic at lower temps. This is a consideration for a long lifespan system. The one in my case is expected to operate till 2032 or beyond.

I don't think other components degrade in any significant fashion whether they run at 40 or 60°C.