The replies in this thread are staggering.
The no boarding pass no human interaction system isn’t exactly a new thing. Many domestic systems have had it for ages and in Singapore there has been facial recognition on arrival and departure for quite a while too, As to boarding passes, you get them when you check in online and they sit in your phone and you scan then or show them if and when required.
Anyone departing Thailand at swampy recently surely saw the speed benefit in the new no human interaction departure gates, just scan passport and use fingerprint scanner. Rolling that system across more parts of the airport is a win.