I believe that the reaper change is trying to take the role of the reaper from really low numbers harvester harasment and push more towards reaper hit squads that can backstab and harass bases and harvesters. Since they can now be made by a reactor it allows a quick change of production for a few cycles if you need to ramp up the harass and will also act as a great means for bio terrans to dump gas before they hit ghosts.
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