GW forced in the Crusades into Warhammer despite there being no need to shove it in in the first place. They didn't need to throw in a real life historical event into their lore, but they did.
If they're going to start throwing around the Crusades into their setting, I'd expect some compensation in the form of them also properly representing the positive effects of Arabian societies. Instead of having them around just to be evil slavers and crusade dummies.
First of all, I knew that (IIRC) Bretonnia crusaded against Araby at some point, but I don't know why or to what ends. So I can't speak towards how much those crusades were like actual crusades and how much they just randomly share the name. I think Araby also has had various clashes with Estalia, making them seem a lot like the westernmost Arabs vs Iberia.
Second, I am not in any way saying that Araby should not have any positive and admirable traits. Just that there's little reason to pull from IRL Muslim history to get that. Araby is the closest to a Human successor nation to Nehekhara. That's quite a good reason to be advanced in science, culture and mysticism.
But the Muslim Arabs still were in a very different situation. Most of their early conquests were against two very established prosperous empires. They had continuous cultural influence from the East, Northwest and South. They absorbed a very large number of cultures and expanded their religion deep into Asia and Africa. They were a bastion of science when Christian Europe wasn't.
Araby instead probably has a history of vying first with Tylos and then with its two highly splintered successors over who is dominant within the uncorrupted provinces of the fallen Nehekharan empire. Those two nations, other than being their repeated rivals, would also be their main cultural contact and trading partners since many many centuries. But where Tilea and Estalia would be heavily influenced by Bretonnia, the Empire and the Dwarves, Araby would be heavily influenced by all the lost treasures and secrets of their ancestors right next door and maybe have semi-frequent contact with the denizens to the South on their continent.
Then there is the question of other historical equivalents. During the time where the Holy Roman Empire used things like guns, the preeminent Muslim power nearby was the Ottoman Empire. Araby is located in the general area of Morocco, Libya, Algeria and Tunisia, but geographically extended to the rest of Northwest Africa, down to roughly Cameroon. So, nowhere near the Silk Road for instance, but instead a nation or federation of some kind with broad access to the Atlantic Sea equivalent and very open to trade with Elves.