Not Matthew Butterick (nor all major English-language style guides): https://practicaltypography.com/one-space-between-sentences....

I only discovered two spaces after a full stop/period was a thing after moving to the U.S., and only apparently in people over 40.

I learned of it only by learning by Emacs! There are movement keys to move the to the next/previous sentence, and I wasn't understanding why they never worked for me.

It's how Millennials and our predecessors were taught to type in school, and it's muscle memory. Very hard to unlearn.

It's not that I have any trouble doing one or two spaces. I just think it's a bit arrogant of any group to decide something is "wrong".

Also, Pluto is still a planet because the new planet definition is absolutely stupid, and it wasn't really their word to work with anyway.