This place is filled with some Q-level conspiracy theories to help people cope. I think the reality is probably closer to them just getting in hundreds of thousands of orders, and constantly making new decisions on how to prioritize based on a ton of variables (part shortages, distance, time, revenue, etc.). Not to mention, you probably have people every day/hour either cancelling or changing their orders, which then throws the whole queue out of whack.
Imagine trying to take a hundred thousand orders, with like...50+ different configurations(?), and then prioritizing that with all the production/logistical complications that go into manufacturing a car. The biggest mistake here is just that they have this stupid EDD range that was probably built for a time when they could be relatively accurate, but that time was probably 6-12 months ago.