I want to control my thermostat and lights by speaking a command. I want my phone to open navigation to and from my place of work every morning and afternoon, so I'll know the fastest route WRT traffic. I want a smart speaker to catalog activities, tastes in music and movies for recommendations, to keep a database of liked recipes to give recommendations, to keep me abreast of news topics I'm interested in, and (in this case) to help me monitor my health.
I want all of this without having to worry about my entire life being uploaded to a private company.