Many parts of the world don't have stable electricity, reducing electricity usage reduces costs and overall emissions in to the planet, and as you approach much longer periods you massively increase convenience.
> reducing electricity usage reduces costs and overall emissions in to the planet
You're going to need a looooooooooooooooong time for the electricity usage reduction to compensate for the enormous energy cost of manufacturing a new laptop. If you care about the climate, don't buy a new laptop if your previous one is still running fine, there's just no way energy efficiency is going to be worth it.