I want to add to this that physics aims at this 'simplicity', i.e. being able to derive mathematical models ab initio, with the least amount of assumptions. Wh

I want to add to this that physics aims at this 'simplicity', i.e. being able to derive mathematical models ab initio, with the least amount of assumptions. While the 'simplest' (in the physics sense) description of something is elegant, it can also be extremely hard to understand and work with. Maxwell's equations are used in engineering for a reason - and not their simpler theoretical physics underpinnings.