it matters. different distros will have different versions of everything, and whatever compatibility problem you had with your CPU (or maybe GPU, since that's more common and you seem to not remember much about it) might not exist in a different version of the kernel or something similar.
the more time and effort is like, literally a couple of seconds for most pcs, unless it has a hard drive
for now i kind of have to turn my pc off all the time because the roof has a couple of leaks right on top of where my stuff is and it could rain at any time. when i move i'll probably keep turning it off though, as i always turn it on and go and get something to eat, so boot time makes no difference, and i just personally hate it when it turns on from any key press
i mean, i used to have an old power supply that made a pretty loud high pitched noise constantly so i had to always turn the switch to go to sleep. maybe they have something similar in the motherboard
sure? i could bring the same argument back to you:
why wouldn't you shut it down? so that you can wait a couple of seconds less?
there's basically no difference. it only depends on what you're used to doing and maybe if you care about the little electricity that's being used constantly for little to no reason
if you always shut it down, when it has an update it'll force you to update and shut down. but people don't like shutting down their pcs for some reason so yeah ur right
put this image on a big monitor and stare at it for 30 seconds, then look anywhere else