I use two spaces because I've been typing for a long time, lol

Good eye! I still do it because, to my eyes, it makes it easier to indicate sentence boundaries while skimming the text.

Some people say this is "wrong", and I won't enforce it on anyone, but I do it when I'm writing my own text. Not only do I like how it looks, but it's a habit I've had for close to 30 years. It's not worth fighting that level of muscle memory, especially when we have Find/Replace All! Haha