[Please read the OP before voting. Special voting rules apply.]

Somewhere between 1950 and 1970 too many people started studying physics, and now the community of physicists has entered a self-sustaining state where writing about other people's work is valued much, much more than forming ideas. Many modern theories (string theory, AdS/CFT correspondence, renormalisation of QFT) are hard to explain because they do not consist of an idea backed by a mathematical framework but solely of this mathematical framework.