The history you quoted forgot the importance of spices.
In the scenario I posted, the effects of the spice and silk trade with Asia without the Roman Empire and its Christian successor states (including the Byzantine and HRE) to protect the traders would only have accelerated the persecution of Christians and Jews. The Islamics always wanted more control over trade.
However, pretty sure the Islamics would have pissed off my Mongol ancestors regardless. They’re just that sort of people.