PEP517's definition of "frontend" and "backend" is unclear to me

[CAM-Gerlach]

Indeed, I pasted the wrong link—sorry about that, and thanks for the catch! I meant to paste this:

Removing setup.cfg and setup.py from the packaging tutorial

TL;DR: is it time to just use pyproject.toml, and which build backend should be recommended? With many build backends now implementing PEP 621 (including PyPA’s setuptools, hatch, and flit), there’s a desire to simplify and modernize the packaging tutorial to just use pyproject.toml. However, there’s been a lot of discussion about the scope of that, and there are currently two PR’s that take different approaches: #1031 shows how to use different build backends, and currently recommends hatch…