The problem I see is these trhings just show up as "recomendations", not requirements.
It seems the wire manufacturers say you don't need it and terminal manufacturers "recommend" it.
Adding the "wirebrush the wire" thing really looks like something added by lawyers. As an installer, prove you did and that will be the out the terminal manufacturer can use if the joint fails.
I would "recommend" it too as an inspector but I am still not sure I could "require" it. I don't know how I could verify that the wire was brushed and if it was "properly" brushed, with the right brush. I know from aluminum welding that you are not supposed to use a steel brush or even a stainless brush that has been used on steel in the past.
