Is soundstage DEPTH a myth?

How could this be a myth ? If listening live you have each aspect of tone,soundstage ,width as well as depth imaging and instrumental textures.

this greatly depends on in a big way the $$ amount invested and system synergy.

having not only been in audio for 40 years but also owned a Audio store in the UK 

this way I have been on both sides of the coin . Sad but true you truly do needto spend well over $20k at minimum to get just a satisfactory audio system ,especially 

when pricing has inflated 25% in the last 2 years. Quality speakers alone command    well Over $15 k for anything in the B class of Audio .  This is why people dedicate a whole year just to upgrade a piec3 of equipment ,myself included.

I went from a $100k+ system to2 much smaller ones .

imo you need to spend at least $10k k in total just for digital to get a truly good reference base system ,to many this too it would ge entry level .it all depends on your budget . Being a Audiophile is a never ending hobby ,technologies especially in digital have gotton substantially better in the last 4 years which is a great thing.

now for under $2k you can get a very respectable sounding R2R dac , $5+k starts the reference grade for example . The T+A 200 dac is my next goal superb Sonic quality and a bargain at $7k.

As I mentioned in a earlier comment in general the more $$ you can spend per component the closer you can get to your audio nirvana .your records yes willhave a bearing on the depth also but if you have  agood balance in quality including 

quality-digital cables then you will get a fair amount of audio realism on a daily basis . Just expect to spend a minimum of a bare minimum of $20k to start 

for a respectable sounding system , and upgrade pieces as you can afford .being aAudiophile can add up $$ very fast.