But street photography is not the only theme can benefit from his style. There are many other styles as well.
Using one main lens most of the time helps you develop an artistic vision which when mastered can be used with other lenses. If you never use one lens on a regular basis but instead change from lens to lens every time you tend to lose sight of the composition of the scene and focus too much on the reach or capabilities of the lens. The lens dictates how the scene will be captured instead of you.
I think it's safe to say that we forget, we can learn from the past. And with Henri Cartier-Bresson, who was an early adopter of the 35 mm format camera, he ultimately showed the world candid photography.
Where later on he confronted and resolved, artists and compositional form.