I read here there are list of stew recipe. what i get is just it help me to made my villager improved building and healing level (by made another sick)

my question is,

1.what is another's function? like made vilager no need to breathe,dance,rainbow,etc ,do those just for fun,or there are some positive effect?

2.could villager be master builder by just exercising?I see building on vv2 is so limited that I cant hv too many master bulider