That’s only been my experience with software that depends on many different libraries. And it’s extra painful when you find out that it needs hyper specific versions of libraries that are older than the ones you have already installed. Rust is only painless because it just downloads all the right dependencies.

Some old software does use 8-Bit ASCII for special/locale specific characters. Also there is this Unicode hack where the last bit is used to determine if the byte is part of a multi-byte sequence.