The formative years teach you to like things a certain way. You may change subject matter but the style and approach stays intact.

Everyone gets into the craft and art of photography at a different point in the continuum. The history of photography is like a stream which amateurs and professionals alike enter at different points as it runs through time and technical progress.  People entering the field now are looking at a whole series of references that draw almost exclusively on color photographs and color centric photographers. It just makes sense since there's no premium for color and the displays everywhere are optimized for color reproduction. Working in color is easier than working in black and white because a photographer is transferring the color from the object of his observation to the photograph with very little need for interpretive thought or multi-step cognitive processes. 

Photographers who were raised in the digital age work predominantly in color and see the process of making black and white images as an after-thought process. Something that can be done in addition to post processing the color files and making them ready for online sharing or inkjet printing. The way their consciousness has been formed around the practice of making black and white images is to see the process as very much a post production decision, as in: "this image might look cool in black and white." There is also much momentum for the argument of shooting everything in color even when the initial intention is to produce black and white as