> There are organizations where SHA-1 is blanket banned across the board

This is very likely the case. And if it is, then it's a lost battle. You simply can't reason with that kind of corporate people, let alone have an argument around this level of complexity. Kafka (the writer, not the message broker) predicted this 100 years ago.

When going through the article, my instinct was changing from "annoying" to "this really sounds like a Python 2/3 moment for Git" to finally "oof this is going to be a mess" in the libraries/submodules part.