I find well-tuned DSP to be “different than” rather than “lesser than” for two channel listening - with my preferences highly dependent on the speakers, their placement, the room, the playlist, and my mood.After many years of playing around with room correction, I decided the game was not worth the candle. The additional DSP introduces colorations that are just not worth the possible improvements. All these curves of how smooth the response is with room correction are illusory. If you move around a room and take measurements, your corrected room response goes to pieces.
I’ve measured at multiple points pre/post DSP in multiple rooms and the results are almost always an improvement in low frequency ringing and time alignment, but more modest improvements in frequency response.