Simple observance of the Double Rest might not have much market in the Bratis Continent, just like Christianity did not sweep the world simply through Sunday services.
However, elevating it to the pursuit of a better life becomes the most basic human instinct.
No matter when or where someone is, what color their skin is, or what status they hold, what language they speak, as long as they are alive, there isn't anyone who doesn't hope to live a better life.
The promise of Christianity to go to heaven after death, or Buddhism's idea of escaping the cycle of rebirth through cultivation (though very few monks actually achieve it, most followers still hope to be reborn into a better life) is also, in some sense, a promise that believing will lead to a better life.
It's like your boss clapping you on the shoulder and saying, Xiao Wang, keep up the good work, now to 996 might be hard, but just hang in there, and you will surely get a promotion and raise later!