I'm not sure, but wouldn't a triangle-based map be just as flexible, if not more, than a hexagon-based map, while possibly being simpler to use? An example of a game using triangles would be Settlers 2, where it works pretty well.
Having been thinking about this and trying to come up with the best approach, I always end up working with triangles and would have to agree that a triangle based map would be the way forward.
Although to maintain the extra directional advantage we got with hexfields you'll need an additional trick or two, but I'm still working on a proposal.
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