Hello guys,
thank you very much for your responses!
They are very interesting and honestly said, in some aspects quite different than was expected.
So now I am even more curious about what comes out of it. 
The results and summaries (and also new GRASS features that will be created based on these serveys) will be part of my master thesis:
https://github.com/ctu-geoforall-lab-projects/dp-kladivova-2021.
Have a nice weekend,
Linda