Canon Rumors - Your best source for Canon news, rumors and creators

I was wondering, since we all know Nikon lenses can be mounted on Canon bodies but not viceversa, is it not smarter to buy manual-focus-only lenses always in Nikon mount and buy an adapter?

That would minimize the inconveniences of side-grading, and would make expensive lenses such as Zeiss, Voigtländer and Schneider-Kreuznach a very safe investment.

Is there any disadvantage I'm neglecting? Any problem with aperture control?