Soundstage depth is real if it’s in the recording to begin with.
AND - If many other things are aligned in your system and room acoustics
Much audio gear just does not image well, particularly speakers, in the true sense of imaging and depth. A properly time and phase aligned speaker not only sounds tonally correct but exhibits palpable imaging.
The biggest obstacle to attain "real life" palpable imaging will be your room acoustics and speaker placement.
I will tell you now, if you have no acoustic treatment going on just forget it, it just won’t happen. If you look at the very best recording studios in the world, they spend loads of money and design effort on acoustics going beyond the RFZ necessity. Once the room has a sufficient reflection free zone in the listening position (the wider the better) then you can start positioning the speakers for optimal soundstage and imaging. This of course is a bit of the chicken or the egg first situation. Acoustics going beyond the RFZ will help with later reflections supporting the ambience of recordings. This is called RT60 and is the length of time frequencies take to decay in a room. If a room is too dead (or dry), the RT60 will be too short and systems sound lifeless.
So you need the right balance in a playback room as well as the RFZ, and speaker positioning.
Many Dacs are also not great at imaging or creating a 3d soundstage, usually timing issues or jitter to blame. I am full digital with really great Dac’s at my disposal so I enjoy breathtaking soundstage and image depth.
Many audiophiles mistaken imaging with just the sense of space versus feeling like you’re actually at or in the venue. This perspective again depends on the recording itself.
I am both a dealer / custom room designer, and I’ve been designing & building AV rooms for 30 years now.
audiobyditomasso.ca