As a Jew reading about Jesus, I thought, 'He's a pretty good guy.' It's the same conclusion Monty Python drew in 'Life of Brian' - if people actually live what he did, it would be a pretty good world. But Jesus and Christianity have a tenuous relationship at best.
Our writers are full of cliches just as old barns are full of bats. There is obviously no rule about this, except that anything that you suspect of being a cliche undoubtedly is one and had better be removed.
I'm not sure why writing for others became harder. Probably a reluctance to give away anything you might conceivably use yourself caused a block. I did it, but it remained hard when it had once been easy.

