Your suggestion makes no sense, if you take a moment to think about it rationally.
People are saying sleeper is overpowered and you are saying that it is invades that need to be nerfed and not sleeper. If invades are the problem, why is everyone only complaining about sleeper? If you have to change an entire gameplay mechanic, because of a single gun, how can you claim that the gun is not the issue?
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The same reason you don’t see it in crucible, seeing through walls makes it so good.