I certainly agree. John definitely brought a great talent for straightforward rock & roll, his eccentric wordplay and his bold, even brash, leadership in the beginning. Paul brought his melodic music hall upbringing from his dad, his storytelling lyrics and, in the beginning, his almost shy politeness. George was the consummate guitarist with good vocals included, and Ringo the required steady timekeeper with good novelty vocals. They were too well matched a group for anyone else to compete!
Over time, though, I believe Paul developed more confidence and took on more leadership functions, especially after Brian Epstein's passing, while also growing musically and professionally. Meanwhile, John's admitted laziness took over, once they got rich & famous and, though he still loved his rock & roll, he added more introspection and mellowness into some of his songs. And George learned from them how to write his own songs.
Yes, Paul may have kept them together a bit longer than they might have gone if he hadn't kept calling them into the studio for the next album, and the next. But, inevitably, the exchange of leadership roles grated on them, not to mention George's growing, but continuously oppressed, compositions. Ringo, too, occasionally felt neglected.
In the beginning they were galvanized together as starving artists with a common goal of rock stardom. But, with that achieved, their individualites began to drive them apart. Then, regrettably, the legalities of splitting up, with all the financial bloodsuckers abounding, generated a rancor that took a very heavy toll on their intrinsic friendship. A very sad, but not unusual, tale.
.