I moved to macbook when my ASUS laptop's hinges broke about 4 years ago because it's ~50% of the cost to fix it. The macbook's capacitor died earlier this year (funny enough it doesn't complete kill it, just makes it run extremely slow, without EE background it gave me a hard time to figure this out), I went to back to PC because it cost ~80% of the cost to fix it, and, touchbar.
But you're right, it's been so many years and ASUS still haven't figured out hinges that don't break? Don't think they deserve the benefit of the doubt.
Exactly, there're many reasons for it to run slow.
If yours is still usable it's unlikely, mine takes minutes to boot up, and it shuts itself down.
It's been a while and I got rid of it but IIRC it still provided power but was under watt, you can confirm by comparing the normal level for you model.
BTW once you've confirmed you can pretty much dump it, won't be easy to find fix other than getting a replacement motherboard, which is pretty much everything.
But you're right, it's been so many years and ASUS still haven't figured out hinges that don't break? Don't think they deserve the benefit of the doubt.