/E doesn't seem to do anything. The help's /E behavior seems to be the default. Whenever V's window is full, more output causes scrolling; so you're always seeing the end (/E or not). It might sometimes be nice to see the beginning, and let additional stuff be added below and out of sight. This shows what I mean (in slo-mo). The beginning scrolls out of view.
(do i=1 to 100 ( echo %i & delay 1 )) | pipeview > nul