Toyota is a global car manufacturing company who has been manufacturing cars (and building new car factories) for many many decades now. This is will be Tesla's first high volume line of vehicles. I think it makes sense for some time to work out kinks in process and meta-processes.

Even a couple of years back when Toyota passed GM as highest volume maker of vehicles, the execs at Toyota said there was a moment where they took their eye off clean processes and Toyota quality suffered a bit. Some of that I suspect had to do with the timing of the retirement of a generation of very experienced people in Toyota. I think they've since been on a corrective course.