That's also not true. Stan literally said that one day he received pages from Jack with Surfer on them, without even knowing he'd created the character. Kirby was responsible for Surfer's motives, his characterization, etc. Also, you really should dip your toe into some Golden Age DC. Superman started out as a rough and tumble social crusader, which was very experimental for the time. Also Superman's characterization was very much born out of the feeling of social alienation. Jerry Siegel once said that the main motivation behind creating Superman was his imagining what if there was a hidden persona behind his nerdy exterior. Batman's origin and characterization is one of the most memorable in all of comics. Everything Batman does, you understand his motives because of his origin. You get where he comes from.
And if DC has been trying to "catch up" since the bronze age, then why has Marvel been trying to create Batman and/or Superman clones since the bronze age? Daredevil, Moon Knight, Sentry, Hyperion, etc. all attempts to capture something similar to what DC has with those two characters. Both companies rip each other off all the time.