That's beyond absurd reasoning, frankly it describes how it's broken.
Either A: Liara has basic level electrical ability OR they need to completely REMOVE the skill option from the list. If it wasn't broken, it wouldn't have been listed or a place in which skill points could be dumped into.
I for example, decided to leave liara until one of the last things i did, and when i got her, i was planning on taking her and wrex to peak 15... only to discover many many hours later after getting her and cranking her electrical skill to max, and playing through multiple stages before getting to peak 15, that electrical funamentally was broken as a combat skill AND as deciphering/hacking among other things.
I could backtrack many many hours and revert, but frankly this seems like a major oversight on bioware's part since you'd have thought someone had played through it and at least tried to use overload or crack/hack something.