The Angry One wrote...
So they're occupying the homeworlds of 3 out of 4 of the Council member species and nobody cares?
Uh..
Ugh, you are either not understanding this at a fundamental level, or just ignoring arguments to push your own narrative.
The Reapers need ground forces
to assault homeworlds, subdue and control those homeworlds' populaces and to serve as the manual labor and suppression force to initiate and maintain the harvest. Otherwise it's a bunch of two-kilometer-tall robots stomping around shooting things with lasers while the natives run around in circles, anywhere but
inside the harvest ships where they need to eventually go.
The Citadel only has 13.2 million inhabitants. They're not going to
get enough ground forces -- assuming they can capture it with zero loss of life and immediately turn that populace into ground forces -- to wage a war against some colony worlds let alone a homeworld.
The batarian hegemony's leadership
is already indoctrinated. Easy conquest, easy source of ground troops, the closest place to arrive
as you yourself put it. Meanwhile, the rest of the galaxy is already divided and in a careful balance of power among among powers that have varying levels of tension between one another. The best way to use that to your advantage is to
divide and conquer. Humanity is the odd man out, distrusted and with elevated tensions with the other races,
and is next door to the batarians.
Moreover, the rest of the galaxy has Reaper IFF's which would potentially give it the same free reign of the relay network as the Reapers have, has military technology reverse-engineered from Reapers, communications devices independent from the relay network, and most importantly
the industrial capacity to put those advantages to immediate use. The turians for the navy they already had successfully held their mass relay, until overwhelmed by sheer force of numbers. Now, imagine if an entire galaxy due to a singular catalyzing event switched to a war economy; for what we know about the galaxy, its industrial-scale production methods, and its production capacity its military strength could increase by orders of magnitude in a matter of months.
Unless the Reapers destroy that production capacity by attacking homeworlds and colonies piecemeal and before the galactic community recognizes the scope and scale of the threat and responds accordingly, they're asking for serious trouble. What is
guaranteed by assaulting the Citadel too early is to drive that reality home to the organic civilizations
very quickly.
Remember what happened after the Cerberus coup? The asari and salarians, who up to this point had been equivocating, joined the humans', turians' and krogans' war effort in earnest. The Cerberus coup
was that catalysis for unification, and that wasn't even direct Reaper action! ...and what were the Reapers doing in the meantime?
dismantling the organic races' capability to sustain a war economy.
It's logistics. Logistics,
logistics,
logistics.