Font weight issues in Inkscape

Since last night, i've been trying to 'fix' a font display issue in Inkscape. At least i thought i was. Majority of the time was figuring out what was actually happening.

References:
Installing fonts - Inkscape Wiki
Cache Directory Tagging Specification
Flatpak - the future of application distribution
Install Inkscape for Linux using the Snap Store | Snapcraft
Stack - Some fonts in Inkscape don't display in Inkscape
Launchpad - All font weights are not shown
Gitlab - Rendering Issues with certain font weights