I have an iPhone, an iPad mini (with a keyboard cover) and a laptop. I always have my phone with me. Whether I also bring the iPad (and whether I also bring its keyboard cover) or the laptop depends on stuff like where I expect that I might be able to get work done, how much stuff I want to lug around and the specific tasks that I expect that I will try to do.
My mom hasn't even bothered to figure out why she can't connect her laptop to her Mifi, so seldom uses it, because she can do everything that she needs to do with her tablet.
There are a lot of people here who seem to take the view "well, it doesn't work for me, so how useful can it be". If you feel strongly enough about it to post the opinion, maybe you should look beyond examples that confirm your bias.