The idea of a camera that only shoots in black and white will sound absurd to most people, which is an entirely rational response. If a luxury rangefinder camera without autofocus wasn't bold enough, removing color from the equation might trigger some people. Still, the removal of coloring offers three key benefits for your photography.
The first is that more light is reaching the sensor. Since no RGB channels compete with the light, the result is just more light reaching a monochrome sensor. For photographers, you have a much higher ISO ceiling (ISO 200,000, in this case) and more dynamic range for your imagery.
The second benefit is the significant increase in the sharpness and detail of your images. Since the sensor is purely reacting to luminance and there's no color interpolation happening, you have a final idea with more clarity than the color counterpart.
Finally, the noise response in these images looks better than what you'd get from a color sensor. There's no color noise, which makes it less jarring in high-ISO situations. Likewise, the amount of noise at equivalent ISO levels from a color sensor is noticeably less here. And because of the increase in detail, the noise responds more cleanly. It's just not as muddy.
Thus, indeed, a no-color camera will be outlandish for most people. But if black and white photography is at the core of your work, the M11 Monochrom might just be the pinnacle of that experience.