Because we already have Bach? It would be stupid to be just a copycat of someone, that's why every famous artist in history at one point got fed up from copying the past's masters and finally did their own thing achieving greatness.
Never prevented us to have tons of artists doing music the style of other artists...
The premise is wrong anyway, people do make music in the style of Bach, both exactly in that style and borrowing from Bach, but also in general baroque/romantic/melodic classical styles.
It's a non-sensical question.
Is greatness about skill, or about getting lucky (right place at the right time)?
and that question is really:
Do I matter? Do my feelings (which feel so real to me) affect the outside world?