(own a tm3, assume whatever slant for what follows)
well as to the one fear, being tracked all the time. do you have a smart phone? okay, you are tracked.
as to whether or not you need to fear being remotely disabled by the manufacturer that remains to be seen. what is more worrisome would be government mandating a manufacturer do it to one or more cars or the idea if a company folds a keep alive feature or such fails and all the cars go dark.
as to bugs, well that is a real issue and what perfect timing you have. recently Tesla made this big push to deliver version 2019.40.50.x in order to give people this preview on full self driving. Namely showing that it indeed recognizes lights, signs on the road and alongside, and more. However two issues.
1. I have had four .x updates since the first for bugs. Even .7 which just got to me Thursday crashes the display if you do sort your contact list you can crash the display and it has to reboot. The car still drives, just no display until it reboots
2. To see the FSD demo features you need HW3 which means all TM3s prior to recent do not have that but instead have HW2.5 Those who bought FSD either with the car or after were promised it included a HW3 upgrade that was heavily hinted as being performed before EOY19. It was not and Telsa has gone dark, meaning they won't give you a date or anything when asked. Telsa is going to piss off a lot of owners if they make this right
Now OTA is finally resolving issues many have had with lack of features other brands have had for a long time. You can finally select the track of music playing from your BT phone in the current playlist... clumsy but it works. You however cannot select which playlist to play. Voice commands finally showed up but Tesla does not provide a list of them, for that you have to rely on 3rd party sites for a quick list. [0]
As for FSD itself, all the safety side features are pretty much growing to be common place in other brands. Not consistent though and you do need to buy a new car each time you want improved or new features of it; unlike Tesla. Meaning a 2019 Corolla cannot do what a 2020 can in regards of programmable safety. This does not mean Telsa has the implementation, just that unlike other brands if they add a feature you don't need a whole new car to get it. The key FSD feature is that a Tesla will drive on nearly any road for you and do it very competently. Some brands geofence where you can use it.
[0] https://www.tesmanian.com/blogs/tesmanian-blog/voice-command...