I think that's it: weight is saved by reducing the leg's diameter, and reducing the 'fittings' in size. The more you reduce its weight, the flimsier the tripod will get.
I don't know how they think that tripods with 10 mm diameter legs will ever be able to hold anything. One test i think everyone who would ever want to get a tripod should do is to lean on it. If it doesn't move, lean on it more, until it does.
I wouldn't even dare doing that to any of these flimsy thingies.
And apart from that: one 'gust' of a calm breeze, and these thingies will topple, even with the lightest of light digicams on top.
Maybe something completely different, like Manfrotto's articulated arms, could serve your purpose?