The fine article submission asks:
Is it a good thing that people who engineer for a living can now get their names on national news for parts designed 10 years ago? The next time your mail goes down, should we know the name of the guy whose code flaw may have caused that?
One key difference here is that the engineer(s) responsible for redesigning the switch and not changing the part number were not just implementing an everyday change that happened to be buggy. By not changing the part number, their actions are more akin to trying to fix a known bug that has exposed the company to huge potential liabilities, and then hacking the version control system to make it look like the bug was never there, in full intentional pursuit of obfuscation and ass-covering.