When will sonos fix one's alexa microphone sensitivity problem?

My experience is when the room is quiet and nothing is playing on either device. I was just testing mic response in an identical environment.
In that situation Dot and Echo do return similar performance: the Dot does better than Echo only when it is placed some distance from its connected speaker/s and music is playing. It is just the music source being too close to the mics that causes this impact and as I said, in that sense both Echo and One will always remain equally handicapped compared to a well placed Dot.

I agree that in your trial, Dot, Echo One should return similar percentages. On the other hand, Sonos HAS said that the Alexa part of the One is in beta stage, though I suspect that Sonos marketing may themselves have not realised.indicated this in marketing the One as a fully baked product.

Not much to add other than the fact that I have the same experience with the Sonos. It simply seems deaf unless I'm right up on it. I have a Dot in the same room with a different wake-word and it consistently hears much better even when there is loud music playing. I understand the proximity of the speaker to the mics on the Sonos probably contribute to the disparity, however even when the music is playing low on the Sonos it still turns a deaf ear 90% of the time. Frustrating.