i don't anticipate that screen EVER coming to the GMC ... my guess is they want to keep that exclusive to the Escalade. When I look an Escalade as similarly equipped as possible the difference is still $20,000 or so minimum. Load up an Escalade and load up a Yukon Denali and it's closer to $25-30k difference.
Yeah - i don't see how the difference can only be $10-12k either.
Not looking at XL or ESV but the small size with 4WD.....the Denali starts at $75,295 and the base trim Escalade (Luxury) is $80,840. Tack on the Reserve Package for the Denali and you're at $84,250. I really don't see what else you'd need to add other than accessories since that pretty much makes it fully loaded in my mind.
To get all of those Denali features like the magnetic ride control, adaptive air ride suspension, pano sunroof, etc. for your escalade you'll need to add the Premium Luxury Platinum package which takes you to $109,740. You still would need to add the trailering package for $600 taking you to over $110k.
So the difference is really around double of what you're saying....at ~$25k.
As far as the screen goes - I can see Yukon's and Tahoe's going to Tesla route.....which has been adopted by Ford with the 2022 Expedition and Toyota with the 2023 Toyota Sequoia.....you're gonna get a large 14-15+ inch screen right in the center console. They can't make it ultra luxurious like you said, because they don't want to eat into their Escalade market which is next level luxury.