On scrap it adds constant pressure to the defenders. When you are trying to capture a point that is defended by 3 ships and you can only get into the capture zone from one specific angle, then you want them to feel the pain of the sandstorm, because otherwise it will be nigh impossible to get there. If the sandstorm is only in front of the opening and not going through it, from north to south, then the attackers have more problems, beause the defenders can see them coming through the cloud/sandstorm first and get the first shots of.
On Dunes I never had any problems with it. If snipers have that much trouble then they should realise sitting in their spawn and sniping the other end of the map, the enemy spawn, isn't going to work. And actually, sandstorms often don't do anything for them on dunes, because they can go above them or below them and get a clear shot even with the clouds rolling through.
And for retreating there is one thing the sandstorms do better than anything else: They lose your spot instantly. You probably know the feeling that when you go into a cloud and suddenly you are spotted, it doesn't happen in sandstorms. And if they flare you, there is a good chance half of them are lagging and unable to hit you
, but when it is for example a Metamidion chasing you, they probably won't use the flare and you can easily escape, because in there nobody will be able to see the other ship.
Although I never used clouds like the following, you could use them to fend of ambushes, they can happen in Dunes, yes. Nobody wants to start an ambush in the middle of the map and you can just chill above or below the sandstorms in the middle of the map. When something happens, chances are you already saw that ambush coming and are prepared.
I have nothing against making the cloud patterns in general more random and as long as the number of clouds on the map doesn't increase they probably won't be too many server or graphical issues. But even though they are not random, I have had very few matches where they make the match worse for both teams and those worse matches where probably when I played with some novices together, because they don't care about that sandstorm, they are going to fight in the center of the map until victory or defeat.