There was another thing about the series that bugged me.
Presumably those statue things with the long fingers and tentacled chins on Ilos were the Protheans. Yet in ME2/3 that all went out of the window when they decided the Collectors were the Protheans.
Retcon tbh - in ME1 they hinted at them being Protheans. Then they changed this to being a previous species (Inusannon) on Ilos, and the Protheans simply colonised over the ancient remains of that civilisation.
Probably done because Collectors and Javik with tentacle faces would not look "badass" either as enemies to fight or an ally, and also probably not be easy to model/animate.