the asari have known about them for at least ~2500 years and have learned... nothing, as far as I remember.
iirc they were aware of the reapers though and just chose not to share it with anyone
That's my problem with Mass Effect as a setting. The fact that no one seems to innovate- so much so that the Reapers rely upon that stagnation.
I can accept all aliens being vaguely humanoid.
I can force myself to accept (begrudgingly) the idea that humanity managed to integrate and assimilate into *Galactic* society in just 30 years.
But the idea that *none* of ME's races, including races like Salarians and Quarians- species known for innovations- never though to innovate beyond Reaper-placed technology is just stupid.
Just because the Romans built incredible aqueducts in their time doesn't mean people in the Medieval Era stopped attempting to do it themselves.