Is nature the best medicine?
With popular art, commercially viable art has to be valued by the majority of people. Most people want to see 'pleasant' 'nice', 'pretty' representations of the world, which is why nature photography and floral textiles are perennially popular; because nature always shows balance of design and textiles tend to use balanced designs.
We can consider what is good resonance for public consumption; be it something natural which pleases us by its reminder of the natural world or of abstract ideas which portray a vision: then we might say by comparison that art which does not have an inspiration from 'beautiful vision' lacks a philosophy which might be important to communicate - and ultimately to enhance society in any era.
Is art for the people or as self indulgence for the artist?
Art is made when the artist resonates with a perception and wishes to express it. We can ask if there can be a point at which such expression has little or no quality to resonate with viewers: whether it is a 'good' or 'uplifting' visual experience, (usually the case for decorative art) or whether it represents the human condition, often expressed as 'angst', as in poetry and theatre.