Dwilight has a lot of sea regions, which can make travel quicker. But it also makes it a hellavalot more expensive. And riskier. But yea, otherwise, for the most part, it's terrible for this. Not to mention the sea zone through city chokepoints, the large deserts, and the many mountain ranges that make long distances ridiculously longer.
The problem with marching too far is not only the time spent doing so, but that farther we go the more morale penalties our units get. Mercenary settings can be used, making the unit much more expensive to maintain, but imo it doesn't reduce the penalty enough. Those distance issues used to be a good thing, to prevent the superpowers of old from enforcing their hegemony everywhere, but I find that benefit to no longer be very relevant.
