idk man i think giant ancient robots are cooler when we don't have all the answers about them. it's like how the horror movie monster is never as scary as the idea of it. you have to let people sit with that unknown and fill in the answers themselves.
with that said i do like the idea of cybertronians/fictional societies having contesting theories about the origins of the ancient space robots. that's always fun. it's specifically when the reader is aware of this stuff that it gets less fun
another part of it to me is like, if you know what you're doing, you can either figure out how a machine works or find datasheets and manuals for it. it ruins the sense of "this is a machine from time immemorial" if you have all the answers. do you know how much of human history isn't recorded?
why would the ancient robots conveniently come with all the answers if you're trying to sell them as ANCIENT robots?
There's definitely something to that. There's tons of things in fiction that just don't need explaining. It makes them far less interesting.