I've just read the news regarding the 3D functions that Photoshop has discontinued. I currently work creating mockups that use 3D objects (.obj) in order to interpretate the product's distortion that I design.
As I downloaded the last upgrade (22.5), I had to activate "Deactivate native canvas" from my preferences, so that my mockups could work back again properly. My doubt, and naturally also my highest concern, is wether this function will continue to be available in future upgrades or not, since I use this in my everyday work.
»Currently, we don't have any concrete plans to introduce advanced 3D features back in Photoshop.«
»The Substance line of 3D products offer state-of-the-art 3D creation tools, and Photoshop’s image processing, compositing and layer-based documents and interface make it the ideal tool for compositing content from other Adobe applications.
We encourage anyone interested in 3D to check out Adobe's exciting line of Substance products:«
To me that sounds like one should not expect a reintroduction of (edit: relevant) 3D features in Photoshop anytime soon.
To me the key words relevant to your question are :
"...........the time has come to retire Photoshop’s legacy 3D feature set........."
"For a short time, a Technology Preview preference can be used to emulate the last known working state for 3D features."
So, I would keep an old PS version around to open and work on any existing files, but look to move to a new method for new files. Even keeping an old version will not last forever as operating systems and hardware are updated.