Yah, nothing the GP says makes any sense. I've been working with large code bases with many languages for many years. None are perfect, but the GP makes no sense, sounds like poor decisions or poor code rather than a poor language.
The idea that pinning versions and using environments will make your code run stable forever is very wrong (in python).
You can't even get things to run for a few years this way. Many of the packages are simply not available anymore. Ever tried to get an environment running that uses qt4 on py2.7? It really wasn't that long ago that py2.7 was standard (in the stable code realm that we're talking about).
If you want a long term snapshot of other people's packages, the onus is on you to store them indefinitely. Packages can be pinned and installed from a local folder.
