And while I agree that most of their characteristics come under scrutiny, the ability for 3/4ths of the band to function as competent singer is something which is still rarely even attempted in most bands.
It's hardly suprising that two genius songwriters managed to develop good instrumental abilities, attract other talent (a great drummer, a great producer, a great guitarist), put out records with great vocal arrangements, and bring out the best in covers. And be worshipped by the public. Those things are almost inevitable. The only surprising thing was that they ended up in the same band.
Group singing - yes, some, but not multiple people rotating the 'lead singer' role. There was no 'lead singer' in the Beatles.
Many of the similar merseyside acts of the time were "so-and-so and the foobars" and such. Lead singer name with accompanying band ('rory storm and hurricanes' for example).