this is fabulously preposterously easy to recreate with plug ins in the digital domain .
When I watch live music performed the stage is generally much wider than 3m. So to my mind having a "soundstage" that attempts to portray that is simply being accurate. Not an added effect. I have 487 LP's & 304 CD's. If it is so easy to reproduce a soundstage that reflects the original performance then why did this LP stand out.
I obviously understand that on a studio produced track on track on track, any soundstage would be fake but on a live recording ? Where is it on Diana Krall's Night in Paris ? Presumably they had all the technology you mention at their disposal but I just don't "see" her on stage, or if I do it's through a gap in the curtains.
ps. I see lots & lots of speaker reviews that mention "too forward" or "a deep soundstage" so perhaps it's just me missing the point. Is a wide soundstage really not very important, or realistic ?