Thanks for speaking up. It's true, developing an add-on for Plone core is not well-documented for Plone 6 (and it was questionable in Plone 5), and this story will improve soon in the open PR at integrate coredev.buildout (was PR #1670) by stevepiercy · Pull Request #1671 · plone/documentation · GitHub which you can preview at Contribute to Plone 6 core – Contributing to Plone — Plone Documentation v6.0. Volto documentation does a much better job of guiding newcomers to develop and contribute an add-on, so I would recommend starting there.
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