I'm at a loss wih what to say to you then. Hopefully one day you will know a bit more about your industry. What im saying is correct, no doubt, it's also easy to confirm for yourself, I can't spend any more time trying to convince you of the plain truth
Anyone can write whatever they want on the Internet it doesn't make it true. Most suppliers don't have a clue about their hair either and the Indian and Chinese factories make it up as they go along. Tell you anything so you will buy from them. It's not the factories you are talking to its agents they pay to find new customers for them who are not interested in you once you have paid.
If you add up all the experience on here from salons to suppliers it would be vast, and most if not all don't agree with what you're saying no matter how much sense it makes to you.