Extruder (and its gears) will also wear with stiffer more abrasive filaments. The recommendations is to use hardened steel nozzle and hardened steel extruder gears.
As you said earlier, there is much to learn
From my research
"The hardened steel extruder unit is equipped with double gears made of hardened steel, which provides increased extrusion force, prevents slippage, and enhances abrasion resistance. These gears enable the extruder unit to handle tough engineering filaments such as carbon fiber nylon and glass fiber nylon."