I don't understand the concept of calling the emergency pipe if your going to allow a trickle to harass you day and night at the slightest water level variation. It makes no sense to me.
I think the link you provided in an earlier post, and whose pictures you have been using as illustrations, makes a particularly cogent, sensible explanation. While the arguments for leaving the oveflow pipe completely dry are conceptually valid, the practicality of the matter is that the trickle presents minimal risk based on the lack of user failure. I had run a Herbie type overflow on my single weir 180 from 1992 until 2007 (part of the time as FW; part of the time as a reef tank), always running some level of trickle through the 'emergency' and it was essentially silent and never came close to failing.