Why don't more recordings have soundstage outside of speakers

Actually, many recordings can image outside of speaker boundaries.  IMHO listening equipment is just as important as recording quality.  My audiophile evolution has in part been driven by a desire for better sound staging and realism.  I am now at the point where I frequently hear images outside of my speaker locations.  I also hear depth, and height.   I primarily listen to vinyl through tubes, including and SET amp. Speakers are ls3/5a monitors and KEF LS50 / both known for their imaging abilities.   I am familiar enough with my system that I can hear sonic differences when I change equipment.  One of the points I listen for is the ability to hear outside of the boundaries of my speakers.  Some changes that I think would be an improvement are not, and vice versa.   Equipment is very important, but does not have to be expensive: the first time I really became aware of outstanding image width etc would through a mid level Thorens TT, Stanton 881s cartridge, VanAlstine Super PAS3, a restored pair of Heath W4 monoblocks, and NEAR 10m speakers.   Good records are important, but so is carefully chosen equipment.  

pragmasi,
I gave ya the answer above. Okay, I gave ya a hint.  What happens when the sound from the left speaker reaches the right ear? What happens when the sound from the right speaker reaches the left ear?  The sound from the other speaker not gonna magically disappear. The studio tricks aren't exaggerating stuff, they are just crude noise cancellation, cept the noise is the other speaker. Those tricks let each ear hear only one speaker sort a, just like headphones. Reflections got nothing to do with it cept creating false images. Sounds real good too. Most people like it. Makes it feel like you are there. But get carried away and what's in front of you, the important stuff, starts to sound like crap.

I dont have tube amplifier....I own a good S.S. Sansui AU 7700...

Room passive treatment and active control cannot be replaced by good equipment nor good equipmewnt could be replaced by acoustic active  devices and surfaces panels...

There is no way to short the path to the goal.....

I gave ya the answer above. Okay, I gave ya a hint. What happens when the sound from the left speaker reaches the right ear? What happens when the sound from the right speaker reaches the left ear? The sound from the other speaker not gonna magically disappear. The studio tricks aren’t exaggerating stuff, they are just crude noise cancellation, cept the noise is the other speaker. Those tricks let each ear hear only one speaker sort a, just like headphones. Reflections got nothing to do with it cept creating false images. Sounds real good too. Most people like it. Makes it feel like you are there. But get carried away and what’s in front of you, the important stuff, starts to sound like crap.

This does not correspond at all to my experience with my room controls..

Sorry for ytour obsession with "tricks"....

A coherent working with an optimal timing of the waves for each ears can do magic....

A tuning of the room with resonators distributed relatively to the speakers characteristic bass driver bandwidth and tweeter bandwidth response in the treated room can do magic....

A coherently working magic manifesting itself differently relatively to each recording but always staying coherent is not an acoustical "flaw" it is what i call control AT WILL....

You seem very used to work with TOOLS and digital format processing, but working with a specific room and ONLY mechanical devices and our ears it is not the same experience sorry....

A room acoustic is easier to solve by the ears than by the complex equation describing it....It cost nothing....And if is tuned relatively to the users ears....And timbre is not a sum of frequencies only on a dial, timbre is an experience in a room for some ears....

Unless your coherent working or whatever ya want to call it can get a reflection from the right speaker to the left ear one head length later than the sound from the left speaker and invert it as well, then it ain't going to do what you think it does. I can't make it any simpler for ya.