Try to imagine a modern language without support for capital letters, or a language that only supported 4 of the normal vowels. Sure, you'd be able to get by, but it would be a major nuisance factor. That is how important basic non-ascii characters like accents and es-zettes are to western European languages. As you go further East things just get worse, until you get to languages like Chinese which bear no resemblance to ASCII.
So yes, unicode might seem like an unimportant feature to you, it makes a huge difference to other cultures.
You are of course free to work on the features that interest you, just don't try and pretend that Unicode isn't an important feature just because you don't want to work on it.