Yeah, I think that was the weakness of the Star Kid reveal at the end. The Reapers went from inconceivable beings of power and destruction to, "We had a war with AI and this was the only way. Trust me. I did... calculations."
Yea... and then the dlc didn't help much either. The life they were modelled after was cool but throwing such beings the idiot card kinda takes away their cool factor a bit. I liked the thorian a loot more tbh. But still, nothing can beat Sovereign's awesome.
Rudimentary creatures of blood and flesh,
your minds struggling, too taxing, demanding,
You've touched my mind, disciples of belligerence,
fumbling in ignorance, incapable of understanding,
There's a realm of existence so far beyond your own,
endlessly infinite while dust collects from your bones,
You can't imagine it, no hope to understand it,
Your galaxy is ours, your worlds are our thrones,
I'm beyond your comprehension, my mere presence causes tension,
Collect the coffins, I am here... I am Sovereign.