It's often thought that the sciences require a more critical attitude than the 'humanities'/'arts' (including, sadly, philosophy), and the arts are thought to be subjective. (Art being subjective leads to absurd conclusions like that a Beethoven symphony is no better than the sound of banging on pots and pans randomly.)
This kinda screws up the fields, because it means people aren't even trying to get closer to the truth.
In art, we can see a big difference between the modern art movement and when people do it because the market wants good stuff.
Good links, and good points that I hadn't considered.
I think the other problem with art is that we lost the other objective standard- that of accuracy to real life, becuase with photography, being able to create a really lifelike image ceased to be unusual.