The definition of art
You are saying nothing new,and you original OP is overblown,flowery,dogmatic and verbose.
As a very broad loose brush the core of what you say is good.
You neglect the subconscious awareness and the primary fact that art is an expression of the artists desire,his politics,his vision,his intentions,his dreams,and most times his opium to cope with life.
You also seem oblivious to the fact that art can also be dishonest propoganda,and that mainstream art is in the main bourgeois hegemony.
Most art is opium. A coping mechanism for life,ditto metaphysics and theories.
High art is instructive and didactic.
Real art is extremely rare.