Related, we have modern word processors with kerning. Only one space at the end of a sentence! I always find+replace when folks send me documents to publish with double-spaces.
Don't get me started.
I write really long documents for a living. While I don't see this issue at work, when I encounter it in the wild, the vein on the side of my neck starts throbbing uncontrollably. Unfortunately, I'm married to a person who thinks the double space at the end of a sentence is a good thing.
There is also a space after an ellipsis... like this.
Not...like this.
I don't care if everyone does it wrong, it's both harder to read (less functional) and it flies against normal punctuation conventions.
Also, don't get your punctuation inspiration from Japanese games. An ellipsis is three periods, no more. Exclamation mark always goes after question mark. ("?!" = correct) Japan adopted our punctuation marks and did it their way. If you're writing in English, do it the English-language way.