Actually, it's generally because gendered pronouns are often seen as offensive by the hyper-charged social justice warrior crowd that programmed this, under the premise that genders are not real.
Here, several examples, super cringe worthy ones at that. To them, it's better to simply assume that someone has no gender rather than make the incredibly offensive social faux pas of calling them a he or a she (or a xer or a hon or a han or a hen or et cetera) without them explicitly telling you what their gender is. Because god help you if you think that having a dick* makes you male and having a vagina makes you a female, you cis gendered shit lord.
*Obviously does not somehow disprove the existence of transgendered people. All they have to do is inform me as to their state and preferred pronoun and I'll generally use it, even if it's something comically insane like "xer." Most transgendered people are also incredibly patient and nice people who are willing to deal with my occasional fuck-up in trying to understand who and what they are. I just feel sorry for them that the social justice crowd has hijacked their thing in order to promote the
intolerance, progressive stack pyramid.
Example of the progressive stack in action.
Seriously, I'd be surprised if social justice warriors remembered that animals exist outside of their headmates thing. Don't look up headmates if you want to remain sane. Just don't.