First, you’re Irish, so I’m not sure about Irish pop culture.
In America, I find a lot of pop culture to be fairly awful and low quality and annoying and artificial corporate crappola, so I think there are many negatives. We also have problems with a culture that over-values extroverted behavior and under-values intelligence, learning, sophistication, and thoughtfulness, and that’s all emphasized in our pop culture, especially in our TV & film history and music and radio and so on, where short one-liners, sound bites, put-downs and zingers and truisms have way too much value, so I also consider that negative.
So when you use the word “important”, it has connotations to me like you’re likely asking if it’s a positive thing, to which I’d reply “In America, often the pop culture is crap and best ignored and forgotten as much as possible”.
However it’s not all bad. There is also much good and interesting, original, worthwhile or at least funny stuff in pop culture, too. So there’s also popular shi… pop culture content, too.
And it is important, yes, both in good ways, and in that it forms much of our conversations, thinking, community, connection, references, idea exchanges, learning, etc. Even the crap points to the issues and problems and meltdowns, and gets some positive attention, eventually.