What I was referring to is:

> [...] at work we don't even use the .toml yet because it's relatively new, we still use a python_requirements.txt and install into a venv that is global to the system.

Unless your `python_requirements.txt` also carries checksums, like uv's lock files or poetry's lock files, that is. Though of course things get spicy and non-reproducible again, if you have then multiple projects/services, each with their own `python_requirements.txt`, all installing into that same global venv ...