The modern peer review system is something Einstein didn't have to deal with for example.

Obviously none of his great papers could have survived peer review. Some people argue that this was merely because of trivial stylistic issues, and could have been fixed by giving citations in correct format, and so on and so forth, so that they read like modern peer reviewed papers.

Perhaps

But the fact that he got his degree with a boring trivial paper, when he had several of his greatest papers in hand, suggests that there was no fixing them. If they could not be submitted for a degree, probably could never pass peer review. Peer review is in a sense a form of committee, and committees tend to be dumber than their dumbest member. The primary job of a committee, whatever its ostensible job, is to make sure that no one rocks the boat, just as the primary job of a bureaucracy, whatever its ostensible job, is to breed red tape with red tape to generate more red tape.

Getting a group of people to function together so that their output is smarter than any one of them is hard, a deep and unsolved problem. The normal outcome is that their output is dumber than any one of them.

The scientific community solved this problem from the late seventeenth century to late nineteenth or early twentieth century. Although engineering continues to advance, and more powerful tools such as DNA readers continue to advance science, science itself seemed to run out of puff after Einstein.