These effects scale. If every single laptop uses a small amount more power than is necessary, the relatively minor increase in energy use for one computer totals up to a significant increase in overall energy usage. Not to mention the unnecessary obsolescence of hardware. The externalities of manufacturing new hardware - and disposing of old hardware - are extremely significant. Just so what? So my perfectly good 10 year old laptop has enough RAM to run 6 Electron apps at once?

Sure, your ceiling lights use less energy than your fridge. That's not a justification for everyone to completely ignore turning them off when not needed.