Absolutely. As a long-term Japanese user, I won't even consider a learning system for Japanese unless it has #2, and the other 3 are highly, highly desirable.

Absolutely. As a long-term Japanese user, I won't even consider a learning system for Japanese unless it has #2, and the other 3 are highly, highly desirable. So much so, that I can't imagine picking a system that doesn't understand why they're better, since so many other systems already exist that do.