Even IF the reapers couldn't do everything the harvesters can (which is definitely not supported by the game), or maybe they lacked numbers to be everywhere at once (also not supported by the game, also, Harvesters are not spaceflight capable, they need to be transported by reapers!):
Reapers do carry Oculi, which are AI or VI -controlled space superiority fighters, capable of damaging frigates! As seen in the ME3 Prologue and 'the fleets arrive' these are also comparable to Trident fighters, meaning they are superior to shuttles or Harvesters in every way. So the Reapers do not need harvesters for that task.
Reapers (as well as their troop transports) can launch drop-pots full of husks and other ground troops from orbit, they don't need harvesters for that either.
Well Reapers stomp around after planetfall for some reason (dunno, perhaps easier on energy consumption than floating and shedding mass), seems that Harvesters are a bit more maneuverable. Using a Reaper for pretty mundane troop shuttling sounds a bit like overkill. The Oculi have no troop compartments and the troop transports are huge. Dropping pods is nice but gets a bit more complicated when shuttling your troops around after the initial drop. I can see some advantage in some kind of troop transport-air support vehicle which isn´t 200 meters long in the tiniest, up to 1 km in the biggest version like Reaper transports. My initial thought actually was "use your troop transports instead of harvesters," but then I checked if they have some in small sizes, which they don´t.
But still, if the Reapers saw a need for that, they should have built some smal ships instead and not gone dragon hunting.





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