Relax! At this time there's not a real effort regarding gameplay. Altough a lot could be done, I think that right now Devs are focusing in finishing the features, don't know if because lack of manpower, motivation or because it doesn't have sense to make a lot of effort when some features are missing. (Some words about gameplays and balancing from the devs would be nice, and would clarify things about how they want to work that stuff)
Later, probably when Beta, I think that balancing, gameplay and all stuff will be relevant one more time.
At first, they have a game designed, but when you have to make real the thinks on the paper, everything change. Also, reading the DD and some open tickets, I think that you can see thath some of the first ideas of the game were a lot of features without a cohesive design.
Later, when you can play, you can decide what add, simplify or remove. Sometimes you have a lot of ideas, but makes things a lot of complex. Sometimes you add a lot of things that nobody uses.
BTW, if right now you can play 0 a.d, (and I think that it's funny enough!) it's more to test the engine than for the real gameplay, and solve the bugs and make things work.