We had to leave the default imports in there to take care of the initial case where the user would have selected none (probably not the best way to do it, I agree). You can remove the same and I will consider deleting them from the style.css in the upcoming update if I am able to add default settings for fonts in case the user chooses none.
I can add the option for Cyrillic font but we have had like one or two requests max for all of our themes. I am not sure it would be something that we would want to do for everyone considering the number is so small. My feel is that is it is better to customize the theme than make this a general option for everyone. Hope you agree.