What is well documented are untested claims that embryonic stem cells may provide new therapies for various diseases.
The identification opens the way to understanding these genes’ functions, which may lead to solving problems from infertility to degenerative diseases.
The key word here again is may. But nobody knows for sure.
Why do the tentative words bother you? That's how science works.
Hypotheses are developed. They use words like "may" and "might."
Seriously, do you have a problem with science?