It could be partly a CYA issue. I bought new tires installed on new wheels at Costco. They told me to come back in a week for a free re-torqueing of the studs. Costco does not take any chances with someone wanting to sue them if something happens to the car’s wheels.
Having said that, if the wheels are new they may need a certain amount of adjusting as the studs seat themselves.
Strangely, when you buy a new car, there are no instructions to go back to the dealer for a re-torqueing.