I still don't understand what's the problem with simply using "you" as second-person plural pronoun, most of the time it's perfectly clear from the context whether it's singular or plural. And if not, there's also "everybody" or "everyone".
In German we have "sie" which is both third-person singular female, third-person plural, and when written "Sie" also a formal second-person singular/plural. It works just fine.
True, which is why it needs to start with people choosing to be called ‘it’. It's yet to happen, but I'll do my bit if/when I'm ever asked for my preferred pronouns.
Also, as someone currently leaving in a place rich with Scousers I would put forward ‘yous’ as a second-person plural pronoun that rolls off the tongue a bit better (and, I would conjecture, makes more intuitive sense for learners of English).
I have encountered a few people who use it/its pronouns.
I might not even be willing to refer to a dog as "it" in most circumstances.
Honestly though, I'm with you that it's a linguistic gap English needs to fill. Similarly, the second person plural pronoun need to be accepted as "y'all"- and I say that as someone not even from the southern USA.