All those languages make it quite clear that you only get access to a code unit that way and other APIs usually exist to actually get access to code points, whi

All those languages make it quite clear that you only get access to a code unit that way and other APIs usually exist to actually get access to code points, which then usually take a string and an index. That the most visible mechanism of accessing parts of a string is based on code units along with UTF-16 masking bad code unless Emoji are involved (for most developers at least), is a problem, though. UTF-8 makes the failure case pop up much faster as pretty much every language doesn't only use ASCII.