You mostly understand my comment, but not my graybeard perspective.

The modern disaster is exactly that developer culture has forgotten how to do this for the most part.

But, you're focusing on Rust compiling when I don't think it is relevant. If those weird financial platform developers were aware of cross-compiling, they wouldn't think that a developer tool like Git has to be built to run on the target financial server platform. They would be capable of cross-compiling or otherwise staging their build into that platform while still using Git on a supported workstation platform to manage the sources.