Maybe I just don't know how to look, but I'm not seeing a feature that Mobi claims to have in action: hyphenation.
Hy-phen-a-tion is the thing that helps book typesetters make the text be flush to the sides of the page and not have ........ long ....... gaps ........ between words.
And, assuming it works, one of the things that would help it is an improved hyphenation dictionary. So we don't badly h-yphe-na-ted words.
What am I mssing?