Think about it. RPG combat is about resource and threat management on the fly. You pick which targets to focus on, when to use skills to maximize your damage output of survivability, and react to your enemies’ actions in order to complete the encounter.
However, when you are 3T farming, you are not doing any of that. Instead you have a giant equation, with NP gauges, Craft Essences and Servants on one end, and enemy health pools and class composition on the other, and you are solving it where the time taken to beat the node always equals to 3, without your enemies even having the opportunity to act.
That’s not an RPG, that’s a puzzle you solve. I’m not saying it’s a good or bad thing, but I find it kind of funny that the most efficient way to play the game is to treat it as if it was of a completely different genre.