I imagine that the less overt attention to theming and storytelling in large part has to do with the fact that convention business is naturally going to be different from their usual clientele. There are plenty of people in this world who find Disney kind of cheesy and, for example, would roll their eyes at the idea of staying in a giant recreation of a national park lodge in Central Florida. So I sense that they're trying to reach some midway point between a nice business hotel that will compare favourably to what conventioneers are used to and a themed Disney resort that appeals as much as possible to their traditional market.It's possible that Disney wanted to give convention-goers a layout they're familiar with. Nothing wrong with that as a goal.
You can argue that Disney should just be Disney and not dilute its brand in trying to appeal to those who don't like its products. In general, I would agree with that. However, conventions are obviously lucrative for Disney and the people who attend them have to go wherever they're held. Personally, I think I would also really appreciate the amenities that this hotel offers. Particularly if I happened to be travelling by myself, I think this would be one of the more appealing options on property.