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Pip now checks this, but you usually use something like Poetry to give you a concrete lockfile with the correct transient dependencies locked in.

My "heaven help you" was more that, if you are in that situation, you don't really have an exit strategy in python. Do you?

yeah people are often lazy about adding a requirements.txt

Neither of these problems have happened to me since pip introduced their new dependency resolver (I think sometime during 2020). All dependencies are installed, and packages in the default repo usually have consistent dependency lists.

It's another story for conda, which flat-out refused to install my list of around 10 packages (that seems to stems from the fact that most packages are in conda-forge, and requirements are often inconsistent with the default repo).