I’ll put a bit of a different take on this; in the sixties, British bands (since the OP leans that way) were greatly influenced by American blues, and rhythm-and-blues musicians. They then enthusiastically created an impressive new form of rock music.
Why didn’t that happen here in the US initially? It did, that synthesis, plenty of good musicians, but it wasn’t given proper airplay, most probably due to the racial issues this country was going through at the time.
Britain, sans the angst of US racial issues, allowed the development of that music, which was so fine damn new to the ears, and it’s recording industry allowed it to be distributed and held in esteem, with fine British guys singing it. It was angry and rebellious, but not as threatening as the Black folks coming up. And, safe for them to come over with that “new” sound to the US.
That was a singular moment in history, a confluence of African American beat and white/European interpretation. That combo bore great fruit, through devoted minds of young musicians.
Now, it’s just not as slam bang new, there are so many permutations of music to choose from, and more media avenues, pretty overwhelming. i’m older, so don’t grab on to new music as much as I used to, 'tis a wonderful province of the young, as it should be. Most Rap doesn’t thrill me, but ocassionally I see that some amazing creativity in that form. It codifies in the same manner as blues.