I'd suggest because this is a new plane model, they simply don't let it fly, so there is no need to "beat the pilots about turning the 'melt engine' feature off

I'd suggest because this is a new plane model, they simply don't let it fly, so there is no need to "beat the pilots about turning the 'melt engine' feature off until we can design and build out a fix for this". Airplanes are not the latest video game: we try to avoid a bunch of downloadable software patches required for a brand-new airplane (just as I think should be the case for video games, too). Also... continuing to have a 737 rating for decades, all in the interest of saving pilot retraining hours and making it cheaper for airlines to purchase these new aircraft, is partially why we're in this problem in the first place. Boeing needs to suck it up and truly claim a new airplane is, well, new, and requires new training.