More depth, more demanding, more to think about, simply more interesting. There is nothing ‘snooty’ about preferring classical music and wishing children to experience it. There is a reason why Bach, Mozart and Beethoven are still played hundreds of years after the pop music of their time has bitten the dust.
I was a singer in semi-professional choirs for many years - not, alas, something one can do into old age. I learnt how to sing at school. I have sung with several well-known orchestras. It is fashionable at the moment for people to say they enjoy ‘all genres’ of music, but I find that a bit indiscriminating.
I don’t think you can use the term ‘modern music’ to refer only to commercial pop. There is modern ‘classical ‘ music too - operas, orchestral music, songs. It’s being written and performed all the time.