The cultivation method is suitable for the entire population, and its effect is quickly visible. In the world of Zheng Yichen, for those with good talent, a noticeable improvement can typically be seen within half a month.
After that, the progress slows down significantly. Essentially, this cultivation method is specifically designed for emergency scenarios, providing fast entry and quick effects, but that's about it once early effects are seen.
It won't immediately lead to the emergence of any exceptionally outlandish beings. To cultivate someone extraordinarily unique, the individual would need to be a one-in-a-million genius.
Otherwise, at a minimum, it would take over half a year to not only see quick effects but also to achieve new breakthroughs.
This method is also widely adopted in his world, and its introduction didn't cause any social issues because his world values martial prowess and everyone has some foundational skills already.