Thanks for your message and the information, yes, I'm sure this would help other users as well.
Everything you wrote is EXCELLENT, shows greatly what we can do in general to increase lifetime of our devices.
There can be lots of issues with the power line: electrical noise, over/under voltage, power spikes etc. all affect the operation of the power supply - which can drive the problem to the connected PC components.
Even expensive PC power supplies may be not able to filter these out - but a good UPS can do this and provide "good" power source for our devices.
Without such UPS, yes, for example the over-voltage can damage motherboard, CPU, storage devices or even other components.
Also yes, the temperature is a key point: if we keep our devices at lower temperature, this would greatly extend how long we can use them.
Many times the operating environment (which includes the power source, temperature, dust, vibration, shock, etc...) can cause damages and shorten lifetime - and we can avoid these, we did lots to extend lifetime.
Thanks for sharing, I'm sure your recommendations are helpful for other users too!