How so?
I have in my pocket a 5.5" iPhone 6S+, which is much more powerful, with a great camera.
An iPad mini only adds bulk to me.
As opposite, I could list the many ways the Apple Watch has great utility. If needed, I will provide such list.
I don't check the time with an iPad. I don't control my music on a Bluetooth speaker with an iPad. I certainly can't do so from my wrist. Can't wear my iPad. Can live quite easily without it. While my Apple Watch gets used daily.