I was reading this recent Scientific american article wich I found interesting, and was spurred on by it to ask a couple of questions. Is the mathematical concept of fundamental point particle currently a basic postulate in physics(let's take as current physics the QM based-QFT modern models)? I'm thinking about mathematical concepts like the Dirac delta and modeling point sources with Green's functions as something necessary to keep linear superposition and QM as a linear theory, (not sure we can talk about the different QFT's being linear or not). Is the field concept in QFT really more fundamental or not? Is the term "particle physics" really a misnomer? How should one picture the high number and diversity of quantum fields,(one for every possible fundamental particle... scalar, vectorial and tensorial... interacting and ad free...)?