To the newbie.. can anyone explain what the difference is between 2019 and 2020 models?
I didn't think Tesla really had model years...
Sure, I will try anyway.
Tesla always had model years, just like every other car manufacturer. I believe that noting a model year on the car is a requirement in the US. What you are likely remembering is that, in the past, tesla did not release the "next years model" until the year had actually clicked over into the next year. Thus, in 2018, 2018 model year teslas were made up until december 31st, 2018, and when they started making cars in 2019 those were 2019 model year cars.
This contradicts other car manufacturers who release the new model year somewhere between july and december of the previous year (2020 BMWs have been on sale since around august / september).
Anyway, for some reason that we are unsure of, tesla has changed their stance on this, and started delivering MY 2020 cars in November of this year.
Now, onto the actual question you asked. Since tesla does not currently wait until the model year changes to make changes to the vehicle or manufacturing process, there is no hard and fast "model year 2020 gets or doesnt get this or that".
There has been small de contenting of the vehicle (dead pedal removed, frunk bag hooks removed are the two I remember reading). The reason one would want a 2020 over a 2019 deals mostly with depreciation and the fact that a 2020 is a "year newer" on the depreciation scale.
Here is a thread where people are talking about it, but because I have had my car since december of 2018, I have not read said thread:
MASTER THREAD: 2020 model year Model 3 and the differences, if any, from 2019
Welcome to TMC btw