Don't take most of what I post seriously, unless I am specifically speaking about a behavior relating to the car and the way the software is performing.
Those posts come infrequently, but are well grounded with miles of experience from V10.2 to current release.
While I agree with your overall thesis, at the same time people who were 100% safety score testers, such as myself and many others here, have had it soo long that we are able to detect the most trivial of changes in any performance of the software.
This is something, that someone starting on V12 does not have the expertise of knowing. This is due to the old software was always 2 steps forward, 1 step back, and those using the system at the time learned to be hyper aware of the progressions and regressions.
Since V12 came out, and all the subsequent releases, I have noticed no regressions from update to update. The only exception could be the ASSO addition, in which most users are pressing the go pedal when they need extra speed or disengaging when going to fast. Turning off the ASSO seems to have ZERO change as to how fast ego (the car) maintains speed.
Personally, for me, V12 is a quantum leap forward after suffering for years on all the other stacks.