Yes, part of the 10 minute thing is about getting the body to switch over from its shorter term anaerobic energy system to its longer term aerobic (cardio) system.
But you are right, ANY exercise is good. And a journey of a thousand miles begins with a single step, and small but regular amounts of exercise can help build your fitness and
The other thing is that it is difficult to make a universal recommendation that applies to everyone. Recommending 2 minutes may well be appropriate for some of the people you mention, but many others can and should be doing a lot more than that. A single figure is not useful for everyone, but then again not naming a figure at all doesn't provide much of a guideline.
I guess encouraging people to do what they can is about the right approach?
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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