IF that's true, and can be supported (even roughly) by in-game events, I would actually be ok with that. If the Reapers are super-futuristic AI, I think it's really, really stupid for them to harvest species and stuff, like I was saying in my last messages. If they're Cyborgs though, that's more believable. At least, to me. Perhaps they need brain tissue for their processing power, perhaps they need nervous system tissue for their circuitry, etc (that would explain the need for goop). All of that tissue is kept alive for an artificially long time through the use of advanced machine technology, and the long cryo-sleep that the Reapers put themselves into after every harvest, but eventually, the tissue does "die," and they need to remake themselves. I'm still not sure that a race as advanced as the Reapers couldn't design better machine-only components for themselves, rather than allowing themselves to remain organic, but that's the sort of thing I'm willing to suspend disbelief for. Perhaps there's even some sort of moral/religious thing going on. I imagine most of humanity wouldn't replace their organic tissue with machinery, even if we had the technology.

Anyway, I'd never thought of them as Cyborgs, so thanks for that perspective. I always heard them called Machines in game, but "cyborg" isn't really incompatible with that designation. I'm still not sure that there's enough evidence to definitively call them Cyborgs, but I don't remember anything proving that's not the case either. I'm playing through again as we speak, so I'll keep an eye out for anything that talks about this.