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That was either laziness - "It takes too long to make voice-recordings for both female and male characters" - or penny-pinching - ""It costs too much to record two versions" - or pig-headed arrogance - "In hard sci-fi, they call all genders 'Sir'" - and they were compounded because no-one at the top levels of the game, either a developer, a marketer or even Q&A, recognised that this was stupid and put their foot down.
Laziness, Penny-Pinching, Arrogance, Lack of Leadership.
These are the qualities that caused the massive flaws of this game that even the most senior bosses of the company that made it now call 'diappointing'.