In 1986 Feynman and Weinberg gave lectures in honor of Dirac, who had recently passed.

Weinberg dedicates his time to answering the question: “what clues can we find in today’s physics that tell us about the shape of the final underlying theory?”

Here’s Weinberg’s “two minute intro to quantum mechanics” from the same lecture:

A popular epistemic tool in physics is that of constraining the theory space.
For example, because it’s so difficult to modify the standard model without running into contradiction (or generating anomalies), physicists argue that consistent modifications are interesting!