Phone is basically vibrate mode 24/7 the Emergency Bypass toggle setting on each contact set, allows me to hear notifications for text or call for a select few while not allowing the rest. I’ve yet to see this feature on another phone. Just one of the things why I love iOS.
I hate to be that person but Android has it too, not sure how long but I had it on my last one before switching to iOS again.
From this post on stackexchange I guess it's been around for at least 6 years.