It seems a lot of people like the idea of a simple motorcycle, and I have felt the same myself. But is there any real reason why I would want one? I guess the assumption is that a simple motorcycle is also cheap, and can be repaired with bubble gum and a popsicle stick. It may also be lighter, and have fewer things that could go wrong with it.
I am torn between wanting a simple motorcycle, or wanting all the comfort and conveniences technology has to give. I already have one of the simplest motorcycles you could ever want, the Honda CD175. One set of points, one carburetor, four valves in all. Gravity feed fuel tank. It doesn't even have a paper oil filter to change, just a centrifugal cup inside the engine. The electrical system is simple enough that you could actually put the wiring diagram on one page.
It is one of those bikes, that one person could probably have a chance at understanding the entire thing if it was all taken apart. Even the carburetor and possibly the gearbox. Yet it works well, and can do 100 kph on the highway after forty years.
Compare that to some of the new motorcycles with electronic cruise control, radios, anti-lock braking, drive shafts, fuel injection, computer engine management, electronic ignition, satellite navigation systems, liquid cooling, even airbags. All covered by intricate plastic panels that take forever to get off and re-attach.
I love some of the instructions I find in the shop manual for my newer bikes. If I want to replace the clock on my BMW, first "Remove the front fairing". To adjust the valves on Mary Ann's Bergman 400, first "Remove the passenger backrest pad". I mean, come on. With the Honda CD175, I could swap in a reconditioned engine and transmission in the same amount of time. And I have two of those lying around. The first instruction in the CD175 shop manual to remove the engine is "Shut off the fuel cock at the tank".