It is true that you see it more these days.
so, we probably all agree on the fact that there is area for top roping and area for leading. I saw some very good climber doing laps on top rope. I think that I heard that Ed Webster do some solo laps on Barber wall and train for placing pro in hackward placement. One of your great climber , and probably SA too, did laps on the prow with a top rope from the top.
In that way, I think that we can agree on some ethic that can be the same for trad and sport, like to give priority to party who lead pitches to the top, not rapping in the route, but to use rapping ring outside where there is no climber under them.
Not working a route and bottom up most be keep to describe sport as much as working a route is more in the sport ethic.
The idea is not to restricted the usage of the cliff to a small number of climber, but to diversify our possibility of style and climbing. A distinction never make barrier, but a mutual respect of the other.... Even if i don't know which kind of respect I had against the guy who top rope the route that I want to lead.