For many people ‘energy’, after it became available, has changed almost every aspect of their existence. Energy also has a huge impacted on animal welfare and on the natural ecosystem. Unfortunately too often a very negative impact.
It looks like that, as long as people can rely on biomass like wood, hard coal, natural gas, refined oil and on nuclear heat, there is not much reason to fully understand what energy really is. Over the last two decades that paradigm has changed!
Regarding the definition of what energy really is, theoretical scientist might have created their own pitfall. Feynman is presenting here a total integrated approach to energy. There is no doubt that it must be possible to develop an integrated approach for energy. But understanding energy can be separated from a theory of everything.
As long as it unclear how the theory of everything will look like, we need a more simplified natural law on energy.
The world is not made up of particles and waves and beams of light with a definite existence. Instead, the world works in a much more exploratory way. It is aware of all the possibilities at once and trying them out all the time. That is a hard thing to picture.