It was a longstanding premise, or assumption, or rule of thumb that I had carried around with me for a decade or two before I formulated it concisely while employed at the late, great, Laszlo Systems, progenitor of the ahead-of-its-time-and-now-sadly-forgotten OpenLaszlo platform.
If I’m not mistaken, my friend Benji Shine was with me when I boiled it down to its essence, viz:
Never upgrade any tool in the build chain, ever.
This rule can be extended to email clients.
You can put this on my tombstone if you like, if I have one, and if Dear Wife says it’s OK to do so. But in any event I want credit for it. Whenever you’re in a situation when some wet-behind-the-ears kid is insisting that you upgrade to Python 188.8.131.52 or PHP 212.3.2 or COBOL 23004040.293949.22, just say “no” and cite Sundman’s Law. Somewhere, Sundman will be smiling.