Just a quick update: I've got my MCU2/HW3 done last Friday. The appointment was postponed 3 times due to parts not available, but it was worth the wait. Tesla in Plano, TX did an excellent job with the install and porting all necessary data. The only things I had to do was to configure the homelink again (naturally, since it is a new/different hardware) and pair up my phone.
Some additional and random observations/glitches:
1) There is no separate volume for music and car-related chimes (such as turn indicators) - this has been mentioned before, so no surprise on my side. It just sounds louder than I am used to.
2) IC screen appears brighter - it is noticeable especially when looking at energy consumption graph. The background directly under the chart stands out from the rest of the screen's background. In the past it was almost the same shade of grey.
3) Base response with default settings (EQ set at 0) than what I have experienced before. I don't have a way to gather any scientific measurements, but I am guessing it has a lot to do with the fact that Tesla parted ways with Dolby Labs and introduced an immersive sound some time back. I don't think it was fully supported/compatible with older hardware, so this probably contributes to the way the music sounds now. Just a speculation, don't take it from me. Either way, the system sounds great (PUP, btw).
4) Arcade - most of the new games that were not compatible with the older computer are showing "Waiting to update". I could not find any solution to this yet, other than seeing some relevant posts on TMC and Tesla forums from people experiencing the same. The car just received 20202.36.3.1 on Saturday and MCU was fully rebooted after, but it didn't change a thing. No biggie, don't care much about the games, but was curious to check them at least once (in case I have a reason to show it off to some youngsters in future
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5) Yes, I can finally count the cones and the car responds to traffic lights and signs. It also offers a mild form of entertainment when rendering full-size SUVs as garbage carts (rightfully so!). The 2020.36.3.1 also added a chime when light turns green, in case someone fell asleep behind the wheel. This can be turned off, but I keep it for now until novelty wears out.
6) Every time I open Tesla mobile app it takes some time for car to "wake up". This is new, for sure.
7) When parked at home, the car still prefers to connect to 2.4 GHz WiFi instead of 5 GHz. I haven't had time to tinker around it yet, but as long as it connects it is a non-issue.
Overall, I am very happy with the upgrade. It brought a breath of new life to my "old" car. Web browser is finally able to render the websites I care about. The whole experience interacting with the screen feels more snappy and responsive, for sure.