I'm disinclined to assume anything, ever. Moreover, the onus of clarification is always on the author.
So, the fact that some synths lack this component communicates to us that it can be removed, not that it is an oversight. By going down the oversight path, we would have to buttress the oversight hypothesis with the further assumption that the part is not removable.
The reason for looking at things in this way is two-fold:
- Firstly this is because each new assumption we add to a hypothesis further distances that hypothesis from reality. And that's why we give priority to the hypothesis built on the least assumptions to the exclusion of all alternative hypotheses - until such time as emerging facts change the balance of assumption.
- Secondly, irrespective of whether or not it might be an oversight, it defines a key part of the game's lore -whether intended or not- in exactly the same way that the words of a text dictate what the text says irrespective of what the author claims to have meant or intended.
Well, there's the thing. You can't wipe a ROM chip - and that's where all the last-resort recovery programming goes.
The point of the mind wipe, as I understand what's been presented, is to deprive the synth of the kind of knowledge which could compromise it's identity if it slipped out in conversation.