Not everyone likes ribbons, and "touch-first Office" is going to be the thing LO needs to aim for, though probably not by imitation. LO could be a big part of making Linux tablets useful.
That's just a viewer. Getting documents to render and making a usable touch interface for editing documents are two very different things.
It's a viewer because editing is disabled. Editing is coming :-)
Having a well-supported full-featured word processor on Android should be very popular. It could multiply the audience for Libre Office. Congratulations on a monumental effort.