There are a lot of places on a boat where you need a galvanic barrier. At the same time, there are applications where you want that electrically isolating barrier and absolutely need fasteners to stay put until you put a spanner, screwdriver or hex key on them. Other times you will need an electrically isolating barrier and want the fasteners usually stainless to not gall or seize when hardware must be dissembled.
For those of you who are blindly following the flock and falsely believe Tef-gel is a totally safe product to use and no safety measures need to be put in place. Please read the product Safety Data Sheet or Material Safety Data Sheet (SDS or MSDS) again available on line. I know the control measures to work with either product are very similar.
As a side note, one of the bales I am talking about coming loose was our spinnaker halyard block bale at the mast head. It did had new nyloc nuts fitted because it was replaced prior to leaving Brisbane for our run up the coast. So perhaps its time to look at the use of nyloc nuts differently when using thread lubricants.