It's also a circumstance where even if the problem is known, the correct solution may not be to fix it on already flying models. Complicated professional trans

It's also a circumstance where even if the problem is known, the correct solution may not be to fix it on already flying models. Complicated professional transportation infrastructure isn't like a web app. Pilots become familiar with the quirks of the machine, and changes to said quirks sometimes require recertification or reevaluation; otherwise, they could jeopardize passenger safety as new behavior interferes with pilots' learned routines. It is reminiscent of the problem with the Apollo flight computer where it was known that rerunning the initialization program mid-flight would put the machine in a state where it had no understanding of its current position, but because they had already woven the computer core the solution was to come up with a way to restore flight state and correct the error instead of making the error impossible.