I've always rinsed on a regular basis. Even with the .84P. Old cartridge habit I guess. I have seen a few Youboob vids where they don't rinse very often, or shave one side of their face before rinsing the razor. I just can't do it...
I rinse pretty frequently, too. Typically, after I do one "facial feature", such as one cheek, one jaw, etc. That's just always been my habit. A side benefit is that it adds more water to the face as you go along.