I find that a lot of photographers try to get zooms that seamlessly cover a really wide range of focal lengths, in fact I did the same exact thing after I got my first DSLR... in fact this setup lead to much less creativity and fewer impactful, signature shots. There are a few reasons for this.
1) I find that even if I have a full range of focal lengths I am only really be able to "think" and see in subsets of these ranges, and I find that if given the chance to zoom in or out I would often take the safest, most simple composition, which is often boring and usually not that creative.
2) Zoom Lenses are a hell of a lot heavier and bulkier (compare the 16-35 with the 14 L II) which makes them a hell of a lot more of a pain in the ass to carry around multiple lenses, so you often only end up taking a single lens which limits you as well.
3) Optically they are alway going to be inferior to prime lenses, both in sharpness, color, and speed. Not only that, but I find that in order to get images that stand out from the crowd, using extreme unique glass helps quite a bit, as it gives you a different perspective than is possible with standard zooms, due to the speed and focal length of the lens...
I want images that are as unique as I can get, they are just more interesting to me, and that is much easier to obtain using unique tools.
When I switched to Canon... I decided to take a new approach to glass. I was just going to buy my favorite prime lenses as fast as possible and stay away from zooms for the most part.