[...]because nearly everyone who speaks English is a capitalised pronouns user. I. The subject form of the first person pronoun. While it’s not a matter of importance to most people, it is still the proper form used in legal documents and anything else that needs to be done “correctly”. And it got that way because someone, at some point in history, felt their pronoun ought to be capitalised and convinced everyone else to generally agree.

This is as far as I got. That isn't why we capitalise "I", as others have pointed out, and if the argument held true then we'd capitalise "Me" as well, which we don't in English.

You've clearly thought about this enough that anything I say isn't going to change your mind, so I'm just addressing the actual argument being made in that opening paragraph because it's categorically incorrect. I'm not going to bother reading the rest because I'm bored already. You might as well try to fight the tide on stuff like this.

I say that as someone who got tired of people shortening their name and instead changed their name to one that cannot be shortened because it's the only effective way to accomplish the objective.