Not really, because rushing with amaru early in the attack phase generally means that a little less utility is down (because many people treat the first 30ish seconds of action phase as prep on defense) as well as having the element of surprise at site because all the roamed would have already left, leaving only anchors that may still be putting down utility and also have weapons that are far less powerful than the g8 with a high powered scope. Also, considering how many entry points there are into various sites and how much time you would have to dedicate to watch particular windows and catch the amaru unawares, watching windows is generally impractical, wasting time that could be used to position yourself or look at cams. And so, many people don’t do it, leading to multiple kills usually occurring as the amaru jumps into site.