I think (just my 2 cents, but in case it helps) the game really needs two tiers of deserts. There's desert and then there's Central Sahara/Qattara Depression desert. The 'bad' desert doesn't need to be impassable necessarily, but it does need to be absolutely brutal on large forces, particularly those on foot or with heavy vehicles - and by brutal, I'm talking thousands of casualties, large amounts of equipment destroyed, ORG hammered and any unit emerging from the desert, short of a small cavalry force or LRDG-style unit (so a battalion or two at most) should be in such bad shape that whatever forces they face coming out of the desert should be able to destroy them in short order.
At the moment, desert plus extreme heat covers the challenges fighting in the fighty bits of North Africa pretty well, but it's far too easy to move large forces (a couple of divisions on foot is a huge force traversing the Sahara, and it's comfortably doable while keeping the forces in fighting shape) through the Sahara or the Qattara Depression. Tanks also move through the inland desert very quickly, given the almost complete lack of roads - many of these regions were completely impassable to heavy vehicles (The reason El Alamein worked out like it did was because the southern (inland) flank was effectively impassable for Rommel's forces).
I agree.
Another area where I think the terrain effects should be modified is fighting across certain edges between provinces. Mountain ranges are an obvious case in point. I was fighting as Japan in New Guinea in my most recent game and it was just ridiculously easy to land divisions in the north and march down and take the whole island. In reality there is an almost impassable mountain range running east/west across the whole island.
Fighting did take place across this divide, notably on the Kokoda Trail (https://en.wikipedia.org/wiki/Kokoda_Track_campaign). Perhaps one way to simulate this type of terrain is to have specific combat width modifiers for certain province edges. In the case of Kokoda you could have a CW of 10, say. Some other edges should have a CW of 0.
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