Rule of thumb is if you don't know what it is and have survived this long you don't need it.
How much do you trust technology and how much of your house do you want 'connected' to the Internet?
My friend likes it, he has smart bulbs installed, smart devices and smart door locks. He can check if the door is locked from anywhere and lock or open it with his voice. Likewise for turning on lights.
It is also good for the quick ordering of items. It also makes you feel like you're in one of those 80s sci-fi movies.