Are you saying there should only be one console or that people should buy all the consoles? If the second:
1) Many, if not the vast majority, can't afford multiple.
2) Many can, but don't want to clutter up space with multiple devices, wires, and controller sets (me).
I literally did not suggest anything to anyone, which is why I remarked my comment is only based on my personal experience, since I have no issue with either points you make - which are valid points.