Good work, and I think you're right. Someone on here did a heatgun teardown and arrived at similar conclusions.
I would encourage everyone to read his analysis, but I'll summarize it here.
There is a ledge around the inside of the frame. It is covered with double-sided tape. The display rests on this ledge and relies on its adhesion to stay seated. The ledges for the top and bottom sides of the device are the widest (12 and 16 mm), and the right ledge is 6.5 millimeters.
The left ledge is the only side that isn't a constant width. The top and bottom portions of the left ledge are 3 mm, but there is a middle portion that is even narrower to make room for the touchscreen input cable. It's only 1.5 mm wide.
Since this is the common point of separation, it seems likely that the adhesive on the left ledge is not strong enough to securely fasten the display to such a minor contact area.
Although some other factor should be required to actually force the underside of the screen to detach from the adhesive ledge, whether that force is frame warp, pressure from internal components, or something else, the minimal adhesive contact area would explain why the left side would be the most vulnerable to stress.
Do you have any opinion on what is actually causing the screen to lift away from the adhesive strip on the left side?
Or is the adhesive is of such low quality that the screen could separate on its own due to heat and general use?
Thank you for doing this. I look forward to your further analysis.