If you stay in Phuket in the rainy season its very convenient to have a car, even a used older car. But please buy a popular car model, as spare pates are cheaper and garages easier to find. Adapt to the local market. I drive here a small Toyota Vios and I am quite happy with it.
Have the numbers of Covid gone drastically down in Europe/America,etc ?
Will Thailand lift the requirements? I don't see that.
It's rather the other around: Especially in Europe they do impose quarantine now as well. But in many cases in a very "lukewarm" form: Just stay at home.
But checks have shown that in many many cases this did not work at all.