Why was it a greater priority to Allah to inform people of that Dhul-Qarnain traveled to "the setting place of the sun" (wherever that is) than to let people know that certain mosquitoes transmit malaria?

11-year-old boy with abdominal fluid and portal hypertension due to schistosomiasis (Agusan del Sur, Philippines)

Revealing that schistosomiasis is spread by snails was also not as important to the god of the vast universe (from Alpha Centauri to Betelgeuse to Rigel and beyond) as rushing to Muhammad's aid when shy Muhammad is confronted by unwelcome guests. We read in Quran 33:53: O Ye who believe! Enter not the dwellings of the Prophet for a meal without waiting for the proper time, unless permission be granted you. But if you are invited, enter, and, when your meal is ended, then disperse. Linger not for conversation. Lo! that would cause annoyance to the Prophet, and he would be shy of (asking) you (to go); but Allah is not shy of the truth.
While Muhammad's companions are now long gone, malaria and schistomiasis (spread by snails) ​are present to this day.  Do Allah's priorities coincide with your priorities?