All of the above plus one more reason. I wired an outlet into my saw cabinet that has my shop vac plugged into it. Sometimes I use the vacuum without the saw so I unplug the saw motor. I got into the habit of lowering the blade after every use because once in a blue moon I’ll forget to unplug the saw motor and my saw table does double duty as assembly bench, etc. So that spinning blade is a scary proposition if the table is loaded up with stuff. And yeah, safety first, last and everything between.
Losing fingers since 1969