There is a reason it's called an estimate. It's subject to change. On the order tracking page it has a disclaimer telling you as much. We're all very used to places like Amazon boxing stuff up and shipping it to us next day. That works because a great deal of effort has been expended around warehousing what we are expected to want and then shipping it the same day we order it. You're never going to reach the same standard with bespoke products. Tesla is going to move orders around so as to hit the optimal setup for them. Whoever at Tesla told you that the order estimate was accurate shouldn't have told you that. But unfortunately, it's not unusual for Tesla employees to be wrong. What they should have told you is that it was the best estimate and that things are always subject to change. Don't plan your life around the estimate.
Comparing the time frames for US orders to Switzerland orders isn't going to help you very much. Tesla does not build orders in a first in first out fashion. It wouldn't make sense, even for US orders. Locations with fewer cars being shipped are always going to have slower delivery time frames because of the logistics of moving the car. Cars do not move on a truck carrying a single car. They move on a train or boats with who knows how many cars or a truck with around 7 cars. They are going to maximize the utilization of these loads. Let's say they move a car to Tillburg and finish assembly on it, they are not going to put one car on a truck to go to Switzerland. They're going to fill that truck. So when there is a full truck going to wherever you're taking delivery then your car will be on it. Same goes for vehicles in the US going from the factory or rail yards.
This also means that high volume sales areas are going to see a lot less waiting because they can keep filling up the trucks and keep delivering vehicles. It isn't fair, but it is actually the most efficient way to process cars. The alternative is a much higher delivery cost.
