Well, we've been here before, but it amazes me how many Brits/Irish have to told that Adele, and Dusty, and Annie Lennox, and Bono etc etc sing in American accents.
Recently, I was talking about this subject, and a woman in the group said, "Do Americans have an accent when they sing?".
Well, for a moment, that question took my breath away!
Then I realised what was going on.
American accents have become the norm!
Indeed, this has been going on for a very long time.
Back in the 1940s, BBC radio producers were told that British dance band singers using American accents was not acceptable!

My main gripe is that the use of American accents creates " a layer" that separates the audience from the "real" person singing the song.
When audiences listen to Adele, they are not hearing Adele, a young woman from London, England singing, but rather, an foreign "voice persona" based on an American accent.

When you hear, for example, Hank Williams, Muddy Water or Jimmy MacBeath singing you have no doubt that you are hearing that person!

For British rock/pop to have any real artists validity, it must free itself from the shackles of phoney American accents.