I know what you mean about Mozart. Noel Coward once described his music as like the sound of piddling on flannel.
Well, yes, and also I think that should Mozart be born in our day and show the same level of mastery over music, he probably wouldn't become as famous and legendary he is now, even in the future. And I'm sad to see a lot of musical schools and conservatories dedicate their education mostly to classical composers, ignoring the modern musicians who's at least not less talented than Mozart or Beethoven.
We have a whole industry of classical musicians who dedicate their whole careers to play music written over 200 years ago. Hell, they even resist improving the instruments. Take violin for example, it has many functional flaws, like the whole nut and peg construction, and the bridge - those parts can be improved for more reliability and ease of handling, without hurting the sound in any way. But no, then it wouldn't be the same classical violin used 200 years ago, so it's a no-no. They still use chalk to increase the peg friction, when there are very reliable gear mechanisms used in guitars.
Phew, steam blown, thanks for listening, so where were we?