Question Author
Backdrifter - I can see your point - but you have to examine these two outputs in context.
In the 60's, pop was in its infancy, singles were the musical currency, and albums were a few singles and a couple of other tracks. A band like The Beatles would be expected to have a new single ready every couple of months, and two albums a year, plus constant tours.
By the time KB came along, albums were the currency, and it was quite usual for a band to take a year over a new album, with no touring or singles required in the interim.
So yes, The Beatles churned out pop magic every few weeks, but that is because that was what bands did, and KB took years over albums because that was what bands did.
Once The Beatles lost the pressure of singles and tours, they began to take time over their albums, as all bands did, and as KB did, and does.
It's possible that KB could bash out a hit every six weeks if required, but that was never needed from her, so as you can see, it's not a level playing field to say that one act's speed and level of work makes them geniuses, when that was simply normal for the time in which they worked.