it is a small smoke cloud compared to a 100-meter-wide hex.
A 100 meter wide hex is quite large. It could hold over 250 T-80s placed side by side nose to tail.
That is both correct. But You can say the same about the smoke of a BU wreck. The smoke of a BU wreck hinders attacks through it, the smoke of a DS does not. Does not seem logical. That's all.