Also, just how slight is slight?
It only seemed to do anything in the Jungle and it downgraded snow to very cold rain, and the range of that was limited to just their own side.
Do note that it may be less powerful in a region that is not naturally cold as the mountains are.
That's not how it works. It works by decreasing temperature by a flat amount, not by amplifying what cold there already is. Just to make up a number, it decreases temperature in the Jungle and the Mountains both by 20C even though one is much hotter than the other.
I agree that we should improve our towers, but I'm not sure now is the time to do it.
Be sure. It would let us take the Plains, give them a sever debuff on the Jungle, and completely lock down the Mountains, allowing us to empty that region of troops so we can get the revision credit.
But honestly, why do you think now's not the time to do it? What critical component is missing that would justify it? That they developed flying units can't be it, because the frost towers will kill them/debuff them too. It can't be that their skirmishing is winning, because killing their armies would prevent them from skirmishing entirely. What, then?
Unless you have some idea that gets around their current counter(desert wind pushing the cold back onto us).
Their counter is crap, only works when they're near the desert, and the upgrades will negate the counter.
Glory to Arstotzka.
EDIT: You seem like a fairly reasonable guy. Can you explain to me the logic of "Something proven to kill entire armies will not help us in X area of combat as much as something else" that people have been using?