Every system has to decide where to draw the line on the prioritization of realism versus simplicity and speed of play. On one extreme you have the "one page RPG" system where you have exactly two stats and everything uses one or the other, rolled on a single D6. About two thirds of the way to the other extreme you get "Pathfinder has a rule for that," with some systems going into truly absurd levels of detailed minutia in ways that vary from being mote or less mechanically consistent to the old school D&D method of the designers pulling a random table out of their ass for every new thing they don't have a rule for yet and filling it out with whatever nonsense comes to mind in that moment.