Lockfile does not work perfectly for me because it does not lock python version. Using a lock file with different python version or even same version but different OS may fail.
That’s literally his point. Other languages have solved this. It makes no sense that it’s not solved in python. (If your not sure how look at a golang go.mod file or a rust Cargo.toml file.)
There's no reason why Python version couldn't be baked into the lock file or package manifest if pip had one. package.json does this [0]. Since all pip has is requirements.txt, it's a bit of a moot point.