Hey, you have the right to your totally subjective experience and beliefs, but that doesn't mean anybody has to believe you. This just has a lot of distortion and costs a lot of money for what you get.
SINAD in the 70s with lots of distortion? I think that will make the music feel muddy...
Look upon these measurements, ye mighty, and despair: https://www.audiosciencereview.com/forum/index.php?threads/smsl-q5-pro-dac-and-stereo-amplifier-review.10719/
I should add that a great way to tell is to put in filters on the sub, which is easy with certain SVS subs and the app. If I put a 24db filter to cut 40 hz down, I notice a difference in a lot of music. At 60hz it's a big difference. At 80hz it's a huge difference in pretty much everything...
I know that most piano pieces don't use the lowest note, but the point stands that there is potential information, and often information, in the low end of bass for all genres. At least that's what my spectrum reader says.
I know poorer people with Mercedes and richer people with Jeeps. The most expensive audio systems I see are not stereos. They are theater installations.
Bass extension is vital to me. Every digital music recording that I've checked has significant information down to 20hz across several genres. Even pianos go to 27.5hz. I just find their subs to be unacceptable. I suppose if you could control eight of them it would be fine.
If it played loud enough and low enough, it would not be so distorted at low frequencies, and not drop off so much. Even as the room raises the bass, there will still be all that distortion. I find it completely unacceptable. The speakers are magnificent, sure, but again, stupidly overpriced...
The performance below 100 hz, in volume and in distortion, kills otherwise perfect speakers. Triple the volume of that sub, port, and then match them, and you'll have appropriate performance. Even then, it will be overpriced, but at least it will be perfect.