https://en.m.wikipedia.org/wiki/Early_Muslim_conquests

As for your claims about Alexandria:

> Following the Arab conquest of Egypt in AD 641, the city was plundered and lost its significance before re-emerging in the modern era

https://en.m.wikipedia.org/wiki/Alexandria

Once can also hardly read accounts of the conquest of Alexandria and think “my, what an improvement.” A lot of people died. Parts of the city burned. You are also wrong that the schools were closed prior. That was certainly not the case. Alexandria was a major center of learning up until the conquest.

Carthage was sacked and deliberately destroyed to prevent it from being retaken.

Look, yes, there’s a group of people out there that understates they Islamic Golden Age. But that doesn’t take away from the reality that the early Muslim conquests were absolutely ruinous. People were still writing those “important classical texts” you mention when they were killed and their texts burned. I doubt they would have much appreciated that the conquerors much later translated what survived the flames.

What your classics academia instruction seems to have short changed you is in the entire period of history where arab conquest reduced most mesopotamian and north african development to rubble, mostly in the name of religion.

Happily since I was a philosophy undergrad, I am easily able to spot a straw man. The claim was that the Arab Conquest transformed N Africa from a wealthy region to a backwater. This is was really what I was more responding to. During the Arab Golden Age N. Africa was far more prosperous than during the collapse of late Western Rome. If you learned about the history of the region you could discover how inaccurate the premise is as well as the conclusion. Anyway, this conversation ended yesterday so research if you'd like to learn, but I'm out.