I think there is also something to be said about the dollar value of the product, paying off <1uM precision lathes (apc7 is centered to 500nm), etc. I do know that metal things want oil. it good, even on gauge blocks you rub it off before you use it
my hunch is that there is a frequency where this begins to be noticeable, there is probobly an operating region where it does not matter, where it matters a little and when it screws with you
also people often dislike lubricants because it leads to over tightening or difficult torque setting adjustment (how do you compensate for oil), dry makes this more stable for the wrench. This can lead to a boondogle over oil stability, how to not oven oil stuff, etc. Steel has a 'slightly oiled' specification.. and thats for a bolt. try to translate that to a SMA torque wrench. Like with plastic piping, they say screw the wear, the worst thing is over tightening the plastic causing it to burst. in these coaxial connectors, spring deformation from over tightening can be catastrophic. I can see nothing by problems for a company that advocates use of oil but then tries to force people to use a particular oil that they categorized because its just oil, no one will really follow that because too many people have their own opinions on lubricants, and it gets rid of easy cleaning, since the oil might trap crap in it and make the connectors on average for some customers fail alot faster, whereas the life from just blowing it out with duster might be better unless the upmost care is taken, when you know things just wont happen correctly when like, non mechanically inclined people are asked to fuck around with grease in really posh laboratories, and since we are mixing RF and light so much in laboratories now, its a menace to optical systems.