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Depends what you mean by saying it already describes. It is similar to constantly asking why as Feynman said in that video. They are sort of complete as a unified classical theory of electromagnetism which as it happens work well. We are taught that there exist particles and that these particles are sources of fields. Taking classical electromagnetics as example we are taught that elementary particles such as electrons are sources of electric field and that accelerating/deaccelerating elementary charges produce also magnetic fields. But this is very wrong fundamentally although this kind of view works very well practically. The situation is exactly the opposite - there are actually no particles, there exist only quantized fields and what we consider particles are simply excitons or concentrations of all permeating fields. Electrons are nothing more but concentrations of permeating electron field and particles (aka concentrations of another field) which mediate force (aka electromagnetic force) between those charged particles are photons which is why quantum electrodynamics is the best modern explanation of electromagnetism to date which itself is part of greater theory - Standard model.
https://en.wikipedia.org/wiki/Second_quantization
https://en.wikipedia.org/wiki/Quantum_electrodynamics
When two magnets repel each other they are actually being repelled by photons. But not your everyday photons, but the so called virtual photons which can't be detected. Which is why that interviewer asked Feynman a simple question which was hard to answer.
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