It was considered “reformulation” back then. By today’s standards, it’s a conference paper and publishable if you combine it with politics. The diagrams would

It was considered “reformulation” back then. By today’s standards, it’s a conference paper and publishable if you combine it with politics. The diagrams would certainly be criticized today that they are graphical illustration of known expressions, not new and certainly not rigorous. Also, path integrals were taken right out of Dirac’s so called little paper and Norbert wiener’s papers. Dirac thought they are straightforward but not rigorous and was busy with other stuff anyways. Again today if you propose something like that, it would be rejected on the ground that it’s not rigorous.