A few concrete issues:
(1) they complain there are no international standards - And? Why should Japan, who's average size be much smaller than the USA be required to use USA standards? Their population doesn't need to care about people outside of Japan. You could say they should relabel the clothing, all that would do is raise the price and effectively make poor people poorer.
(2) they show people "Americans" get heavier - That might be reality but maybe being reminded you're wearing extra large is a good thing? Like you really are "overweight" and that's unhealthy. You can choose to ignore that but the rest of us aren't required re-label you as something you're not
(3) They graph high-fashion like LV and show they don't have large sizes. So what? Ferrari doesn't make cheap cars. I'm not required to make product that suits you. If you don't like what I'm offering, pick some other company's products. I don't like donuts, I don't go to a donut store and demand they offer pizza. Nor do I go to jeans store and demand they carry suits.
(4) they complain about vanity sizes - why is this an issue? Try the clothing on. If it fits buy it, if not don't. That's what I do because duh!, different people and companies follow different patterns. Some fit, some don't.
If you want to fix any of these - feel free to start your own clothing brand. Clearly you believe the market isn't being served. If so, put your money where your mouth is rather than requiring others to risk theirs