Lots of valid points, here.
I guess it depends which generation you’re assessing. The millenials I know are most definitely not more introverted! Quite the opposite- they prefer to do most things in groups.
It’s simplistic to to expect people to "just turn off the distraction" when they are getting a dopamine spike from it. And if you’ve grown up with glowing screens since birth, you don’t know anything else. You’ve been trained to wholly depend upon external stimulation.
I grew up with a stay-at-home mom, as did most of the kids I knew. We spent much of our time playing outside. Today, most parents work and neighborhoods are empty because kids are at day care or after school clubs, engaged in organized activities. When do kids just spontaneously play and engage/develop their imaginations? When I was a kid I was very focused on the natural world around me and derived a sense of peace and safety from it. I was repeatefly drawn to focus on its beauty and harmonizing effect. How many kids are given the opportunity to develop a capacity for being still and enjoying it? Instead, it’s constant stimulation-- constantly being directed into structured "doing".
Enjoyment of the arts requires a willingness to slow down, step away from the mental whirlwind and allow one’s self to be acted upon by whichever qualities are associated with the art form in question. Of course, if one has parents who value the arts and nurture this this capacity, one is very fortunate.
I could’ve simply said it appears that kids today are not developing the capacities necessary for sitting down and focusing for an extended period on any art form.
Go back further into our history and you will find that playing music in the home was a prominent form of recreation for families. It's a shame this has been abandoned.