I don't think anyone would say filters are a bad thing, or deny that an end-feed conversion can extend crank life.
S.R.M. would. In fact, using any kind of of filter, or use of multigrade oil will invalidate the guarantee.
Yes, you did misread my post. The part of my post you quoted says 'it will carry particles for short ditances.' The highest mileage and longest period of time wthout trouble has been without using a filter and monograde 40's.
I don't bang a drum for any choice of oils or filter use or not, it's their bike and they can run it on what they like. But, when an established firm who have built thousands of engines and guarantee their work tell me something, I listen up. The filter is still fitted to mine but no longer connected to the oil supply, it would take minutes to plumb it in but 10,000's of thousands of miles following their advise to the letter stops me doing it.
Rob