I'm not sure I follow.
Take Highmarch, for example, on EC. The capital is Domus, which is also a border region. With the increasing number of acquisitions North-West of it, Akesh Temple is becoming an increasingly more central location than Domus is.
Would moving the capital to Akesh Temple, which always was more central than Domus, be okay? But moving it there brings it closer to the front, with closer refit times, and Domus' increasing distance from the center of the realm is a direct result of this war.
It's nowhere near issues like Swordfell putting their capital right in enemy lines, or any other case of putting the capital right at the front (though technically I guess it Akesh Temple is at the front, somewhat, by bordering Evora). But there's still a strategic benefit to it (but there always is, else no one would ever do it, even if it's just optimizing tax rates).
