UTF-8 is made in such a way that processing based on ASCII and bytes mostly works. All non-ASCII characters are just a sequence of bytes >127, and the system ca

UTF-8 is made in such a way that processing based on ASCII and bytes mostly works. All non-ASCII characters are just a sequence of bytes >127, and the system can recover if code points are split or truncated. So if you just move strings around and concatenate them, you don't even need to be aware of Unicode, even things like templating can work by just processing bytes. Of course, when you get to editing and rendering, you get all the complexity.