What you are arguing for is a philosophical position called
atomism or reductionism, (which contrasts with
holism). It is a rather old school philosophy honestly (with holism also being old school, but not quite as much) as we are are learning more how important interactions are really to study anything honestly.
Modern philosophy of science kind of rejects the notion that you can study anything really by only looking at the atomic structure of it. This is to say, you can’t really study history by only looking at the actions of individual actors. Even in particle physics you have the 4 fundamental interactions, you have virtual particles, etc. not just. This isn’t to say that fermions and bosons aren’t important, it is just that it is hard to describe any physical phenomena without looking at the interactions between them. And in fact, by studying those interactions, you can derive certain laws and behaviors. History is no different, except the complexity is many many orders of magnitude greater.