[Cainehill]

Reducing the strategic movement of flyers would have the very bad effect of allowing troops that move on foot to move as far or farther than flyers in some conditions (such as when the terrain is plains). I don't think that light infantry is supposed to "run like the wind", or that cavalry should be running faster than creatures can fly.

That strategic mobility is very nice, yes. But it's one of the main benefits of Caelum (who doesn't necessarily even bring armies along), and I'd disagree that the "only" counter was magic transportation (which is, barring artifacts, more expensive, but also goes further). There's also remote summons, remove evocations (murdering winter for devils, fires from the sky against Caelum), stealth units being used to surprise them, and otherwise strategically deducing where they're going next (ie, blind guessing) and attempting to move an army there.

And arguably PD ought to be more effective in warding off such things, but as I believe the devs want an offense oriented game, it seems unlikely that PD is going to be boosted much.