Earlier quoted context omitted.
Anyone should be highly skeptical whenever Tesla adopts an "industry first". There may be good reasons the industry doesn't do that. It may be something that an experienced engineer would advise against.
It's mostly just a lack of willingness to spend on large casting machines. Tesla is famous for purchasing the largest presses: https://en.m.wikipedia.org/wiki/Giga_Press Tesla is partly empowered to do this because electric vehicles are mechanically simpler than ICEs, and the batteries themselves also are made to be structural components. There's nothing fundamentally unsound about pressed aluminum.
Sadly the reason this bad casting was shipped to a customer is probably because they are not achieving the desired pass rate so they knowingly wave through defective castings.