Thought this may be of interest
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Presumably, what’s primarily improved is the rate of wheel adoption.
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Which is an indication that publishers have improved their success rate at being able to build wheels, which is something a lot of us have been prioritising for years.
You didn’t suggest it, but I wouldn’t want anyone reading this to think the improvement happened by accident 
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Of course.
Adoption of the wheel format has a cumulative effect; if your dependencies are also available as wheels, your own project becomes easier to install.
And yes, I do think that building wheels has become easier, in no small part due to adoption of pyproject.toml - in particular, the PEP 517/518 build-system table. In the old days, it was common enough for setup.py’s logic to have a circular dependency - calling setup requires importing a third-party library to compute the arguments, but setup is supposed to be responsible for installing that library.
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