Good, QGIS is one of the projects that can be put closer to the bottom of the stack in that XKCD comic. I've seen QGIS being used just as a visualisation tool, and i mean it's good at it too, but even in a limited use case i am aware of it was used to do important infrastructure work like planning water pipelines and predicting failures for said pipelines.

Edit: https://xkcd.com/2347/

Qgis is a pretty useful software and a great OSS project, but I wouldn't go as far as putting that low. That honour goes to GDAL/OGR, PROJ, et all.

QGIS is more of a slab/deck that links all those foundations together.