Re: The Repeat button has a third state that is redundant; and it should be removed
Repeat with little 1 number is to repeat the current article or book chapter. The other repeat state, without the 1 number, is to repeat the whole reading list of articles (or the whole book), so it's not redundant. There is also "Shuffle" state with arrows crossing, which repeats the articles on the reading list in random order.
There is also a possibility to repeat reading each sentence, but it's not available on that button. You may configure sentence repeating under @Voice Settings menu - Speech settings - PAUSES tab (at the bottom). There is no line repeating nor paragraph repeating, and I have no plans to implement them.