I don’t know much about airplane design. But if you told me that a software was so buggy that it was pulled out of market and then years were spent fixing the bugs in it, I almost certainly would not trust the resultant software more than I would have trusted a complete rewrite.
If aircraft manufacturing is anything like software development (and considering a lot of the issues in the Max are software related there’s at least some of that), this does not make me confident in the Max at all.
Is your software safe from multiple simultaneous cosmic bit flips? The FAA required Boeing engineers to handle this situation when rewriting parts of the software even though flight computers are hardened against this sort of anomaly.
If aircraft manufacturing is anything like software development (and considering a lot of the issues in the Max are software related there’s at least some of that), this does not make me confident in the Max at all.