SPFx and custom code

2 verified answers, each one saying what it proves and what it does not.

How to enumerate SPFx components used on SharePoint pagesWhich client-side web parts are actually on the pages of this site?
How to enumerate SPFx solutions in a SharePoint app catalogWhat is installed in this app catalog, and at which versions?

1 rule: SPO-SPFX-001: A solution is installed at an older version than the catalog holds
1 Field Guide chapter: Chapter 3: What decides the destination
2 analyses: SPFx 1.23.2: upgrading is not changing a number, Why SharePoint Framework still runs on React 17