Its all about preference. My kids love being able to control lights with minis.You can do all of that from your phone as well. What makes this better?
Walking in house (its kinda big) without your phone, happens a lot at home for me.
And broadcasting you need speakers/devices to broadcast to. Personally love the nest hubs. To check security cameras, play YTM videos, etc.
One major missing issue is the breaking of glass feature that amazon has.