The Beatles were always innovators. They were the best boy band. They were then the best Psychedelic rock group.
They weren't...*deep sigh*... they were
not a boy band. A boy band is a manufactured entity corporately designed, generally featuring vapid content written by in house songwriters. The Monkees were a boy band. A boy band is assembled by some corporate guy and label. An actual band exists and is signed to a label. The Beatles are no more a boy band than the Rolling Stones ever were, nor the Zombies, nor the Hollies, nor the Animals, etc. The problem is that Pop music no longer just means whatever music was popular, as it did in those days, hence the pop label brings to mind "oh, they must be a boy band". The Rolling Stones were under the category of pop music in those days. All those groups were in pop music. Then there is the issue of girls, which brings to mind "oh, boy band". No, in those days, screaming girls were the bedrock of Rock n' Roll music. Boys also listened to those groups, including the Beatles, on par with girls. Everyone liked the Beatles. And Rock music was for a young demographic, hence why it was listened to by teens and young adults mostly. This was also the case with the metal and hard rock bands like Black Sabbath and Led Zeppelin and Aerosmith and Motorhead. Teens and young adults were the audience for that music.
Another difference between then and now is that music is very uptight now about the audience. It used to be that you could be liked by everyone (even if they didn't listen to your music). Now these bands don't want that. They wanna be out there, or they want to be bad ass, or they want to turn off everyone except their target audience, or whatever the case may be. The only people that do want that, and target that, are the boy bands.
What lead to the creation of the boy band came out of the Beatles, but it was not inclusive of the Beatles. The big labels looked at what happened with the Beatles, which was a mania, merchandising, selling likeability and putting labels on them ("the smart one", "the cute one", etc), movies and assorted cross marketing, etc, and they used that as the model to make artificial groups, which became the boy bands. The difference between the Beatles and boy bands is that boy bands are astroturf and the Beatles and other bands are natural. The Beatles were what they were and managed to make it big, and exploded and succeeded on their merits, and that was tapped into, and tapped into to make money. Boy bands, on the contrary, are created specifically to generate money. There is no soul to them, and you can see it in their music, which means nothing. Even in the most basic pop of any group, including the Beatles, you can sense there is a soul there because those guys wrote it. You can always tell that a boy band song is a boy band song because it's like a preprogrammed robot. The point of a band is to do what it does, and make money based on what it does. The point of a boy band is to simply find a way to make money, and make something to do that to make money. A band comes from the normal population and is natural and real, and a boy band comes from the minds of corporations for corporate purposes, and it is a corporate, artificial venture cobbled together to be sold to a target demographic, and buoyed enough to keep going as a money making scheme by whoever is running it.