swiping away all your apps doesnt save battery. it never did

watched a guy at work swipe away like 40 apps "to save battery." he does it every hour

meanwhile the battery on my watch lasts about three years and i've never had to swipe anything away... killing them all just means the phone has to cold boot every app the next time he opens it, so he's probably burning more battery than he saves the hourly schedule is impressive though, very disciplined