Maybe its because shes crap?
Popular does not equal good. She can sing, no doubt, but her songs are awful, MOR dirge which appeal to the lowest common denominator. Hence the millions of records sold (see Coldplay for further reading).Really? all the awards she has won and she is crap?
Would like to hear you sing....how many albums have you sold?
https://www.youtube.com/watch?v=dEYYI1ii0AU
Interesting that the scenes that those 3 bands came from (punk, alt-rock/ grunge, britpop) were all ruined in a very short passage of time once the mainstream became aware of them and the majors started signing every band they could in the hope of unearthing the next Pistols/ Oasis./ Nirvana. Those special times in music where the underground meets the mainstream don't happen that often and normally by the time it happens, it's as good as over.
And anyway, isn't grime EXACTLY what you talking about? An underground, youth, working class/ council estate movement becoming more and more mainstream. 'Konnichiwa' may well be this generation's Never Mind the Bollocks/ Definitely Maybe or Nevermind. Seems you are expecting a musical revolution to come from an extremely narrow range of guitar music.