It was uncommon for people to blend daoist, buddhist, and confucian practices in a syncretic fashion. why do you suppose this happened?

Even though these 3 practices have similarities, they also have very clear differences:

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

detente translated to english means politics