This isn't relegated to natural hair per se, but to those interested in using alternative means to style your hair. No matter what stylists or popular brands claim, there is NO SUCH THING as a predictable chemical process(if it involves changing the structure of your hair). If ALL outcomes consisted of uniformity, yes. But considering there are many external factors that can affect potential outcomes, it literally becomes an oxymoron. There are 'likely' results, but with chemicals you don't know whether you'll be a part of that 'likely' or not.