Why is old art seen as good and creative and new art isn't?

I feel the latter is more colorful and imaginative, like the places shown loterally don't exist. When I look at it it illicits something in me and activates my imagination.

Then I look at old art which is allegedly good and I feel nothing. Bland color paletes, and it's mostly just drawings of old people, but somehow this is meaningful. Somebody explain please, what's really so special about the Mona Lisa?
Why is old art seen as good and creative and new art isn't?
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