Tesla doesn't document most of the changes they make, even when they may have a significant impact on users.
Several releases ago, they changed the source of the speed limit data base - which has made automatically setting the cruise control speed unsafe in several areas (on of our nearby roads has a speed limit of 40 on a surface street and the new "improved" database thinks the speed limit is 55; on a nearby highway, it thinks the speed limit is 45 - when it's really 65 - which causes the car to quickly slow down in the middle of high speed traffic).
NVidia does a pretty good job in documenting the changes in their graphics driver releases - indicating what problems were fixed, new features that have been added and listing the major known problems not yet fixed.
Since the forums do a pretty good job in identify all of the problems in Tesla's software, don't see why Tesla couldn't be more open in their release notes - admit some things are broken - and provide a better description of what's in each release...