I enjoyed some of the solo material too, but John and Paul had tons of freedom to bring their songs intact to the Beatles records.
It was clear who's material was who's right from the beginning to the end of them as a band, John and Paul were not in a position to have material sit in a notebook unused.
The career of the Beatles could have been far longer as a group if everybody kept their egos in check, did not involve outside parties into group decisions, and shared more equally in the allowed input into their songs.
John and Paul were stupid to not allow more George input ..and Paul has admitted this.
While some of the solo material was good, my opinion is that John and Paul's solo work was not as good as the music they produced in the Beatles, and could easily have been recorded within the confines of the Beatles, seems that they both needed the other one to add that little extra to make an idea turn out great on record (and George Martin of course).
George Harrison was able to flourish after the Beatles, so good for him.