Thank your for your feedback regarding dithered lens.
From my experience, keeping the laser hidden behind cover while charging has got nearly the same effect as dithered lens. Since the perk costs of dithered lens were increased that much, for many classes, dithered lens is too expensive for its benefits.
Against a skilled fireteam, dithered lens does not allow spamming the plasma caster safely. They will detect the source, no matter if dithered lens has been chosen.
Indirectly hitting fireteam members with fully charged plasma caster shots is indeed highly effective. Moreover, it provides a safe way attacking them, even skilled players go down this way.