HI,
I had an apple watch 4 yes i agree the watch was really good but the iphone has so many issues that i went back to android,and as we know apple dont like to share much with android.
I have a fossil sport and i tested this with my suunto to see how mnay it was adding and well the fossil sport is the same really it adds steps why sat at my desk and drivig,its not as sensitive as the suunto but still adds a few,the fitbit i had also is the same it will add steps when sat at desk and driving.