I think it is mainly a tool for creating educational content. Chord diagrams at the Top of Song Sheets or to illustrate chord progressions and scales.
Together with the other extension "ChordTransposer" you can create nice formatted Song Sheets.
There sure is a lot of specialized software out there but sometimes you just want to add exact customised Chord Diagrams to a Text document. Or add a more sophisticated graphic to your Notation Software.
It's not a tab software. For those kind of things I would suggest e.g. Musescore. The horizontal scale-diagram indeed could be (ab)used to create a short tab or riff but this would be very limited and cumbersome.
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Free Sagreras Gitarrenschule PDF
Free Project: LibreOffice Songbook Architect (LOSA)
See website link