There will forever be a struggle between the simplicity of a thing and how useful it is. I deal with this in software every day. I want something to be easy and I want it to do all the things I could dream of. Those two are, of course, complete opposites and generally impossible. Great design, and great software in the case of my own career, tries to strike a balance somewhere in the middle of these two. 

That’s why so many designers (in my own experience) are a fan of Apple. It’s not that they get this right all the time, but they often try and sometimes do figure it out.