Trees make wind because whenever there was wind, they moved.

I’m not using dual boot anymore, but when I did, I always selected the partition from BIOS, which was totally fine for me. Are there arguments against it?

That’s not the point? The school provides a service and is (probably) not obliged to do so. If the school sets rules on this services, it’s OPs choice to either use or not use that service. 🤔