I’ll watch the video soon (haven’t yet), but I also highly value soundstage. So I don’t think there is a need to compromise — the tiny room I mentioned has among the best soundstage I’ve ever heard from the Genelecs. But I have extensively covered my side walls with foam to absorb just the right amount of reflections.Putting the speaker next to the wall and flatting out the peaks seems interesting because it could also improve the THD of the speaker.
But some "experts" favor the soundstage over anything else:
What's is your take on that?
Best soundstage in my experience varies per speaker and room, and just requires experimentation with positioning and toe-in. Regarding placing speakers near a wall, you do want to avoid placing speakers too close to the side wall, as that will cause very undesirable reflections & “comb filtering” as a result. The same is not true for the rear wall, where there won’t be enough mids/highs radiating from the rear of the speaker to have a significant degradation of their sound quality. And as discussed, closing the distance actually helps bass response as long as you can EQ it.