The problems with used cars are usually:
1. The previous owner abused the car
2. There is known damage which is being kept hidden from you
And, Tesla is an outlier here. Other EVs are progressing MUCH faster.
Kia and BYD are two prominent examples. They're outputting huge batteries and absolutely bonkers charging times.
But even US manufacturers have surpassed Tesla. What GM is doing is more impressive.
For those boosting BYD, etc, the finish is shiny but low quality, and is rife with safety red flags - an example being by in large you can watch YouTube and movies and sturr on the central screen while driving. (It’s scary in Asia with grab drivers watching videos while weaving in and out of traffic) - but the price is good.
Actually to edit this comment - the main (only?) reason I bought the car is because if I'm in an accident I want to try to be in safest car possible and if my sig other is driving I want them to be in the safest car I can find. I thought that paying a premium at release in model X 2020 was well worth the premium if people I love are in it.
I also bought it for the safety. Even the FSD I consider a substantial safety feature. I don’t take naps in the back seat when it’s ok - I pay attention. The joint probability of it or me noticing a drifting car or whatever is considerably better than me alone.