Adhesion resource use
I don’t understand the use for the skirt adhesion resource, since it is disconnected to the piece. Is it some kind of delimitation?
It is to add an extra purge routine to ensure that the nozzle is extruding material correctly before printing the model. With this, you will avoid that the first layer (the most important layer of the model) is correctly printed without underextrusion problems.
Remember to use it if you don't need to use brim or raft.