Soundstage can be at least as much dependent on how a recording / track was mastered (or remastered) as it might be on speaker model / placement x room. Hard characteristic to change, but as already mentioned, DSP can help.
@veerossi if you find “truly great” systems to have a listen, either bring a USB stick with a few of the exact files you think have exemplary soundstage, or at least make sure the same streaming service tracks are available in a short time span. If you don’t use the same source file / master, any conclusions you make could be off-mark.