In principle, but it did never hurt anything when I just straight up cut the power so I got the feeling that I was waiting for nothing. It wasn't like the disk wasn't flushed yet or anything. Maybe it is good to be extra careful when restarting a server or something similar, but for desktop usage I prefer if the init system just kills everything after a few seconds so I can go with my day. Neither is right or wrong just whatever you prefer. I like a cutthroat style in general and I accept the minor risks that come with it.