Toyota had a similar brake software issue in 2010 [1]. They had a fix available 3 days after the NHTSA announced the issue. Toyota issued a voluntary recall for over 130,000 cars in the US. Since the recall was voluntary, it likely took years until some cars received that update when they were serviced for other unrelated issues. I have no idea if Tesla is doing things the best way, but Toyota having the ability to push that update out immediately would have indisputably prevented accidents and possibly saved lives.

[1] - https://en.wikipedia.org/wiki/2009%E2%80%9311_Toyota_vehicle...