1) If we assume that it's essential to genderize pronouns, it doesn't really matter what the majority fits into because existence of other options does not influence that majority at all. The only case where it matters is when someone doesn't fit. The utility remains unaffected (in fact, it actually is increased because of better expressivity).
2) If we assume that it's not necessary to genderize pronouns, then it may be argued that we're losing some information that the vast majority of people was comfortably fitting into - but I don't really understand why do we actually need that information. When I refer to other people, it's extremely rare that I do it in a context that requires me to mention their gender identity (or even what do they have between their legs). In those rare cases where it's actually relevant, I wouldn't mind having to express it explicitly at all, so overall the utility seems dubious.
It's relevant because it's efficient more than 99% of the time and removing it introduces ambiguity 99% of the time. The person you're responding to even said they didn't have a problem with adding more pronouns, just not making it worse by removing them.
My whole point 2) was about how it does not (most of the time it just removes irrelevant noise), so I'd appreciate a counterexample.
Then you fail to see the usefulness of specificity and efficiency in speech, which is both weird and explains why it took you so many words to say that.
It seems to me that it's actually you who misunderstands the usefulness of specificity. It's not useful to be overspecific.
For the record, my native tongue is much more gendered than English (it has gendered nouns, verbs and adjectives; not just pronouns) - I don't understand how it's useful at all, I don't miss it in English.
Personally I agree, for me gender holds little importance, if I'm being most true to myself I identify as non binary simply because I don't really identify with a gendered label. That motivation has also lead me to being ok with being gendered male, because it just doesn't matter to me.
I understand I need to look outside of my own experience to see the importance people place on gender though. You can say all you want that most people don't care, but I feel if you misgender people, a lot of them would be very upset. Trans people are very vulnerable to suicide because of this, to diminish the importance of gender (this includes the binary, of which many trans people want to fit into) to these people is to be at best lacking in empathy.
Now if you're approaching this from a gender abolitionist angle where you believe all this attachment to gender is socialized and that we should push to de-emphasize genders role in society, then I believe that's a far more defensible position, but I feel you need to at least recognize the importance gender has to people today (socialized or not) if you're to have any hope in bridging that gap with people.
So I'm only a grammatical gender abolitionist :) I don't see the point of gendering people when I talk about them unless I talk specifically about their gender. As a happy side effect, this would also massively reduce the risk of accidentally misgendering someone.
I think there's more than a little utility provided by the communication it enables. I'm all for non binary identities and letting people identify across them as they want, however with any change we must also recognize the utility in the previous norms so that we can preserve some useful aspects as we construct new norms.