Filesystems and case-insensitivity

It's a bit disconcerting that someone working on text encoding support in the kernel has such grave misconceptions about encodings. I haven't seen anything but UTF-8 on a European Linux system in more than a decade. Chinese characters (I think he means CJK) are part of the basic multilingual plane and thus are encoded in 3 bytes by UTF-8.

The prevalent GBK encoding uses 2 bytes for such characters, so we're talking about a ~ 50 % increase in storage size. For text. I really wonder who cares about that in 2018. And even more I wonder, who'd care about the storage requirements for file names.