@nikitonsky Great article.
There’s another example where UTF-16 is unlikely to get removed from: USB.
At places in the spec it says “UTF-16LE” but then again, it says “The Unicode Standard, Version 1.1, is the newest version of the Unicode™ Standard.” and “The character content and encoding of Unicode 1.1 is thus identical to that of the ISO/IEC 10646-1 UCS-2 (the two-octet form).“
https://www.usb.org/sites/default/files/hut1_4.pdf (Issue date January 26, 2023!)