I would be so bold as to say that "modern art" is what you get when a culture is in poor health and this shared sense of community, ancestry, and culture has deteriorated.
Well yeah, what counts as modern culture?
I think part of true value in culture in past, was the actual effort it took to make it.
Ergo what you describe as craft and art, is something that was hard to do, given the resources and means people had.
Today the sense of culture is hard to simulate, because for a start the idea is that you can get any result with few attempts and with little effort.
If the time put into something is very long, and you have very little time, the effort put into the art puts meaning into the struggle to make art.
Today you could get 100 000 thousand artist who could probably do the same thing, even better than what Da Vinci is famous for.
I mean there are guys who can replicate master pieces to the tiniest details.
All they need is time and few items which even are hard to come by are not impossible to get, and then reproduce the painting with absolute perfection.
To me most things that made culture in the past, were entirely outsourced.
People were not consuming music, they were making music, and part taking in music.
People weren't buying food they were growing food, people weren't buying stuff they were making stuff.
As we are today, most things are outsourced, we don't sing, we put the radio on, we don't play music we let others do it and watch them on TV and get impressed,
we don't do sports we let others do sports, we don't cook we let others do it for us, we don't think much either, we let other people do that for us, we don't have sense of humor we let other people make jokes etc.
Which is precisely consumer culture.
This means that if there is culture today, we have to ask what value it is, because its not any of what made culture previously.
We have outsourced any activity that was previously important.
Outsourcing these values is not bad per se, but it does mean we have shifted values beyond the values we had previously.
For example in sports the idea was a bunch of people got together and had a competition.
However with rise of professionalism this lead to a point where people had to commit to sports training 24 7 to be win.
Which lead people down the road of absolute non sense. Sports became a domain of professional teams sculpting a perfect machine athlete who can go beyond his or her own biological limitations.
Which is kind of cool in its own right, but is far from sports culture where people were training to be fit, because in the past everyone had a modicum of chance to participate.
Now days unless you are juicing and doping and working out with a coach you are good as last.