"But targeting the other program in such a way is no different than someone installing two A/V softwares. Sure they may conflict in some areas..."

No. Hell no. Antivirus programs conflict for a good technical reason. NoScript and AdBlock conflict because the author of one dislikes the effects of the other program; were it not for that, the two extensions would be completely compatible with one another. Equating these two things with each other completely misses the point.