The role of composers is supposed to be, as all the arts were before modernism, to create beauty and cultural affirmation.
Today, the main thing composers are seeking to do is be a part of corporate machines and like modern artists — churn out mass-produced junk, that doubles as anti-European propaganda pieces. Unfortunately. Now it's all abstract expressionism and conceptualist nonsense.
You just lay on a drone or throw some paint at a canvas, and then try to tell everyone what it "means" with some florid artspeak — it's not even music or a painting (John Cage 4 '33 anyone?) at all, it's just literature meant to dazzle and confuse until the viewer believes that their instinctual disgust is "wrong" and that they just "don't get it".
The fact that this is a question shows you how far it has fallen — as in the past, the social purpose of art, music, architecture, dance, etc. was obvious.
But we live in an age of the meaningless, the inane, and the ugly. One might turn to the fact that those in the hard sciences no longer see the value of art and the history of how this came to be, for answers. In the past, most men of science we also skilled artists. It was understood that just like knowledge of the sciences, skill in art and music were real things that could be taught.
Christopher Wren made important contributions to meterology, astronomy and as an anatomist — yet he is most known as the architect of St. Paul's Cathedral. Though he had many other impressive works of art. In Wren's time, being a skilled architect, architects were expected to have mastery of sculpture as well. Today, they are taught that such sculptures are monuments of an evil, colonial and "oppressive" civilization that must never exist again, and instead, they are taught to build hideous glass towers and gray, Soviet Apartment blocs.
Such men either do not exist today, or are extremely rare and left to passion projects. Modern scientists — with science seeking to deal in logic and objectivity — look at art today as something meaningless, largely because that's what it is; void of logic and now devoid of objective standards, opting instead to wallow in "subjective" solipsism where "anything is art" (and therefore nothing is) and so scientists now see little value in it.
It depends on how one is defining "new".
In the past, new works were ones which hadn't been seen before, but still fit within the established aesthetic framework of tradition. Art Noveau was new. Beethoven was new. The electric guitar was new.
Since 1900, most of what is "new" in the arts, however, is that which rejects tradition and standards entirely, because where standards and traditions are to be found, so too will one find a hierarchy, and if there is a hierarchy, there is discrimination — but without such discrimination, good from bad cannot be differentiated and improvement or quality cannot exist.
Do people still want new and interesting pieces to listen to? Yeah, but they also want those pieces to be good.
I'm sort of repeating myself here, but it's necessary.
Much contemporary music is just to serve as or aid the sale of a product. Think of all the assembly-line pop music that plays in the shopping malls.
Much like with Kandinsky, Picasso, or Shoenberg's avant-garde noise music, it's all about churning out product as fast as you can, getting youtube subscribers, getting it in the next vapid Marvel movie trailer, slaving 12+ hours a day in Hans Zimmer's music factory, etc. so you can (hopefully) fill your coffers.
Obviously, there is good pop music, there are still great composers for the orchestra and folk bands, but much like painters, sculptors, architects, etc. who are still good — whose works are the result of real mastery over their respective crafts — are usually banished by the elite into the realm of hobbyists.
That's my answers to your questions. Hope it helps