Why are there no Reapers in Andromeda?

OK, I'll acknowledge the Prothean beacons but also say that they're basically in an idle state until activated.  And all that fast travel from the Reapers surely consumes a lot of energy given that it uses eezo, something that degrades over time (per the Leviathan DLC).

At the end of the day, though, this might be covered in some way in ME:A.  Since we don't have the game yet everything we discuss are just theories.   How about saving the complaints about "why" before seeing if they address it?  Even I admit they probably won't but we still don't know.

Iakus : In researching something else entirely, I ran across the Vigil conversation. It has some things to say about what Reapers do when they're not invading the Milky Way Galaxy. It also explains why they probably didn't go to Andromeda. Also, it makes sense.

Shepard: How do the Reapers survive out in dark space?

Vigil: We have only theories. The researchers have come to believe the Reapers enter prolonged states of inactivity to conserve energy.
This allows them to survive the thousands and thousands of years it takes for organic civilization to rebuild itself. But in this state, they are
vulnerable.

This illustrates that the Reapers do not have infinite energy to go everywhere and do everything they might want to do. They have limits. Therefore, they sit in dark space and conserve energy for the hundreds of years they'll spend fighting organics. Then they recharge themselves, make sure the stage is set for the next cycle, and conserve energy. Hell, I can't think of an energy source that can survive for 50,000 years that isn't a celestial object. The Reapers are limited and that's why they have to find the real solution before moving onward - assuming they even cared to do so.

As Vigil states, those were only theories. And later parts were proven to be inaccurate. Case in point, in ME2 we go to a Derelict Reaper 'corpse' that has managed to keep itself airborne and shielded for 37 million years despite being heavily damaged. That's 740 cycles worth of time using energy constantly without resupply.