I'm guessing a lot of that has to do with software that gets preinstalled on Windows machines. There was a article the other day about how bad it is releasing laptop in 2021 with only 8GB of RAM. I noticed people in that thread talking about how their laptops after startup are using 6-7GB of RAM , which means they must have a lot of processes going on in the background. I'd imagine cutting down all of the unnecessary background processes would really help with battery life on laptops.