Do YOU have a flat frequency response in your room?

I do believe that there are other more important elements to your sound than a flat frequency response.  Yes, boomy bass or harsh top-end is intolerable, but I would put soundstage, timing, coherence, dynamics, and musicality way above a flat frequency response in terms of desirability.  
 

The attraction of aiming for a flat (or bespoke) frequency response is that it is entirely measurable and achievable for anyone via DSP, and largely component-independent if done electronically or through room correction. Fine-tuning it to perfection appeals particularly to those who like to measure stuff.   The other audio nirvanas (soundstage, timing etc.) listed in my paragraph above are more component-dependent and not measurable and explain precisely why upgrading or changing equipment is the route most travelled.  

 

If you’re using the ability to replicate live music as a measure of success in Hi-Fi sound, then a flat frequency is almost irrelevant as the sound of music in any venue will depend entirely on the sound characteristics of that venue. And every venue sounds different.

I am afraid I do not buy into the need for a flat, or other, prescribed frequency response. I tested numerous combinations of amps and speakers in my room till I found the sweet spot for me. I have measured it and it’s all over the place but it sounds absolutely incredible. I used Roon DSP to produce a slightly tailing off frequency curve but it did not sound as good as my natural frequency bumpy curve and it flattened my soundstage. Room treatments are not possible in the family room where I listen so fortunately I have no choice but to enjoy the wobbly curve I have.