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not always needed, I could show you pictures of a place that has that much steel bonded to the MET its a waste of copper to put on fly leads to MB.Why fit a banjo when glanding onto galvanised trunking?
Personally I use earth nuts these days as they make good reliable contact whether it's bare metal or painted. I only connect a flylead with insulated enclosures or if I have any reason to doubt the earthing of the metal I'm glanding in to.
Gland plates I will run a flylead to the gland plate and sometimes replace it with a brass plate if I have a lot to make off to it.
we are talking about unistrut from window brackets on steel girders bolted to floor.
we get through a fair bit of unistrut. at least 50 x 3m lengths in this one room