Those were MY thoughts as well, and to a GREAT degree it did exactly that - I covered a number of public EVENTS - Easter Sunrise, Memorial Day, parades, etc. with it and it was awesome in the undertaking and results department.
Most of these systems, while also relieving the stress specifically on the shoulder, arm and wrist, and giving GREAT support and stability, are or can be tough on the lower, even upper back - so people with back problems aren't going to be happy with using them for more than creative spurts of 10 minutes or so, standing, even sitting on site, running and gunning with one for an entire event is extremely taxing - we simply aren't made to be human tripods :-) and the additional weight load, over time, is telling.
I am 60, and in Aug. 05 got the pleasure of experiencing totally unexpected open heart surgery. Thought I was having a bit of asthma or something. I dropped from 185 to 130 in six weeks just before, during and after my surgery. Never gained the same degree of body, or muscle mass, following - even almost four years later. I was super stout and strong up until that event, now I am simply too "old" and no longer have the strength. :-)
Someone who works out, who is in GREAT or even good condition, who has no back problems, or bad shoulders, etc. could work miracles and learn that these systems are not the be all, end all to smooth and professional "awe inspiring" production footage - simply another effective tool in the arsenal of acqusition, and impressive to watch in action - that too may be a deterrent to use in some venues. I suppose. I think the footage gained, time used, should be taken from a minimalist approach, rather than a marathon shoot. Like slow motion, special effects and other creative stuff, etc. a little (physically and creatively) with these units can go a LONG way.
I am being honest here, and your questions are by NO means even close to stupid.