A symphony is no joke.
My things really are written with an appalling lack of practicality!
It is not hard to compose, but what is fabulously hard is to leave the superfluous notes under the table.
Composers in the old days used to keep strictly to the base of the theme, as their real subject. Beethoven varies the melody, harmony and rhythms so beautifully.
Study Bach. There you will find everything.
Never criticize the composition of a Royal Highness. You never know who may have written it.