Full Idea
By 1790 the idea that a central task for the aesthetician was to explain or at least adequately to describe the phenomenon of the individual artistic genius had definitely taken hold.
Gist of Idea
By 1790 aestheticians were mainly trying to explain individual artistic genius
Source
Gary Kemp (Croce and Collingwood [2012], Intro)
Book Reference
'Key Thinkers in Aesthetics', ed/tr. Giovannelli,Alessandro [Continuum 2012], p.100
A Reaction
Hence when Kant and Hegel write about art, though are only really thinking of the greatest art (which might be in touch with the sublime or Spirit etc.). Nowadays I think we expect accounts of art to cover modest amateur efforts as well.