All points well taken.....
However, the boys were in the middle of their experimentation with drugs in 1966.... There would be no way they could do a live show while frying on LSD, and back in those days it was the good LSD
I know this sounds terrible, but if it wasn't for their drug experimentation, we wouldn't have great albums like the White Album, Abbey Road or Sgt Peppers to enjoy.... and eventually it was the drugs, and the natural progression of growing older that split them apart. Let's face it, these poor chaps had been practically living together for 11 years (15-28 years old).... hell, most marriages today don't last that long
Basically it ran it's course, and the right one