The Abbasid’s had the benefit of having a golden age in technological/scientific development for Islam, you clearly don’t know history if you think otherwise, also related to the time period.
Now in addition to that, the Abbasid could also have hashashins as special units since they were pretty close.
Fatimid: Date dissolved: 1171
Umayyad Caliphate: 756–1031
All are much earlier.
“fictional house of wisdom”, it’s not fictional, it was a thing, it’s like saying the library of alexandria was fictional, just stop.
Plus the Abbasid aren’t just the Abbasid, it’s the Abbasid-mamluk sultanate civilization, a.k.a the civs that also fought the south western mongol horde (one lost and the latter one beat them).
Also regarding conquests, the Abbasid had plenty of history, from establishing puppet empires in the eastern Iran/Afghanistan region to conquests in China bringing them the ability to create paper for the masses thus starting the translation movement that saved countless ancient greek books.