It costs 5x to 10x as much to fix a defect in the field as it does on the line. There's no way Tesla would make this decision, certainly not for Wall Street. Rework, whether on the line or at a service center, costs Tesla money. Money they have to account for right now, as it happens, each quarter. Intentionally pushing this to later as you suggest would be financial suicide. In addition, the cost of goods for each car manufactured includes a warranty reserve which does impact margins. Having more warranty repairs come in each quarter requires they take a charge against that. This is something Tesla does not want to see happen. Your thesis has no basis in accounting or connection to reality.
Give the folks at Tesla a little more credit than that. They are most certainly doing everything they can to improve quality at every step along the way. It's not easy. It takes time. They are doing this from scratch for the first time. What they've produced is, in my opinion, absolutely stunning. Yes, there will be some problems, and so far the vast majority of them I've read here are minor and quickly and professionally dealt with.