Your post raises many important points and areas for questioning and examination about states of mind underlying the process of making art. I do believe that the consideration of this is essential and I definitely do believe that art can and should be so much more than decoration or commodities.
While I have done visual art always, in the last few years I have done more creative writing than art, so when I was creating this thread I was thinking about how to create the best fiction but I there are issues underlying all the arts, but with slight differences depending on the form of art. In some ways, it involves thinking of the way in which the aesthetics of the art will affect the viewer and about the dimensions into which the audience may be taken into. However, I do recognise the importance of the way in which art has a subjective element, but, also, as you suggest, it involves symbolism.
One of my biggest questions is about the whole question of dark fiction and fantasy. This is because I have to admit that in many ways this appeals to me, as does magical realism. Here, I would say that some of the authors I admire are Cormac McCarthy, Angela Carter and Stephen King. They involve mythic dimensions and do engage with the dark side of life. It would seem so shallow if they did not. I am influenced by the ideas of Jung and Joseph Campbell. I believe that the ideas of Joseph Campbell were used in the making of 'Star Wars'. Of course, this film was about the portrayal of a quest for popular audiences for film.
However, the underlying question is how dark should one go to create a good story,? I am not saying that in reference to making fiction with a view to what would be sellable, but with a view to what is most interesting for others to read. When I was going to creative writing workshops I did find that I was inclined to go in the direction of the dark and was a bit concerned that I should not do so, because I am not wishing to take others into negative states of mind. Ideally, I would like to write and make art which is transformative in a positive way.
I do believe that part of this process may be about getting into positive states of mind in the first place. At times, I have struggled with depression and dark states of mind, so I do try to work on this. I do some meditation. I would imagine that medication has some effects on the states of consciousness which can be useful for creating positive mental states for making art. I do use some visualisation CDs, including some shamanic ones.
Of course, shamanic journeying involves the journeying to lower worlds as well. I suppose this is where my questioning is based. The shamanic journeying is intentionally going to the lower worlds, but with a view to find healing potentials. So, I guess what I am wondering is whether we should be exploring such depths, or simply be exploring higher states of consciousness. This is on the personal level but also in the art we make.
I am sure that there are no simple answers but I do believe that it matters and has important implications.