I turned off Emergency SOS anyway (when it was still around) because I am weird and sometimes repeatedly press the lock button. No I don't watch the screen flash on or off it's just a satisfying click to occupy my hands; I have a tendency to fidget.
I didn't turn it off immediately though, because I did learn the hard way that I haven't broken my habit. I investigated the feature when I first updated to the iOS 10.2 beta and did discover that it was activated by pressing the lock button quickly 5 times. So I just went "uh oh, I'm gonna have to change some habits." I avoided "fidgeting" at first but I did eventually slip up and boy it scared the hell outta me. A.) because of the noise, and B.) because I only narrowly escaped accidentally calling 911.