Alot is 'known' about the brines and deposition temperatures can be determined fairly easily from fluid inclusion studies, but trying to fit currently accepted knowledge of the conditions pertaining during mineralisation in the Pennines with phase diagrams for fluorite seems to suggest that there ought not to be any!
Obviously there is, so something is wrong somewhere.
But that was only one example there are a great many interesting and potentially useful areas for further study and collecting specimens can assist that.
Quite apart from the science though there is nothing wrong with the aesthetic appreciation of minerals and I think a great many explorers are a bit two faced over mineral collecting.
I once went on a trip to Hilton Mine with a large group of mine explorers from a well recognised club and the only difference between them and the Russell Society (a mineralogical soc) was that they only had one hammer between them and they hadn't much idea what they were collecting.
There are 10 types of people in the world.
Those that understand binary and those that do not!