you dont need there to be friction in the thread, whoever said that is wronggg. greasing it makes it easier to tighten and to get off n protects threads. as long as its tightened enough that pedalling isnt going to tighten it anymore so the lockring is tight that when the backwards force is applied the cog grips the lockring. greasing it wont make it come loose, fitted correctly it is next to impossible to come lose because the forces that are applied tighten either the cog or the lockring.
you dont need there to be friction in the thread, whoever said that is wronggg. greasing it makes it easier to tighten and to get off n protects threads. as long as its tightened enough that pedalling isnt going to tighten it anymore so the lockring is tight that when the backwards force is applied the cog grips the lockring. greasing it wont make it come loose, fitted correctly it is next to impossible to come lose because the forces that are applied tighten either the cog or the lockring.