Yes. Han Unification is something people read about online and decide is bad or whatever, but it actually isn’t relevant to using Japanese with computers. People use Shift-JIS and fax machines because legacy technology takes a long time to die everywhere and longer in Japan. It’s not more complicated than that.
This is correct: as much as it's wrong, Han Unification isn't a problem so long you stick to one language to support and remove all conflicting fonts for the other two locales, which are rarely needed anyway in Asia, it just comes back when you try to support multiple CJK languages at the same time. Unicode coverage of each languages are totally fine for 99% of use cases, the Unification problem is just it's reusing the same address space for all CJK languages.
