That makes sense - also the whole point is to add dirt! My bias came from putting together a hi-fi audio system for music (hybrid dual triode /discrete AB power with discrete resistor ladder converter) but it’s probably not the right approach to think what’s good for one is good for the other. Also the second video reminded me that guitar amps / cabinets naturally roll off high frequency which is where (I find) op amps show their shortcomings, so actually it’s probably the ideal place to use an op-amp!