Balance is what it's all about. And the position of the equilibrium point is completely up to your own preference, and you may find it shifting quite a bit throughout the seasons.
And besides, what I notice is that a lot of really bland cutesy slice of life can seem a whole lot deeper if you're paying a lot of attention. Often the animators have quite a bit of detail and art hidden in there. (though of course, this is not always the case).