As a former elementary school teacher, I fully agree. IXL is decent for skill reinforcement but falls short when it comes to teaching new content and principles. It turns out most students benefit from learning in a group where another student might not get the content initially and ask clarifying questions and have the teacher repeat, rephrase, and reteach. Or classmates work in pairs or small groups and teach each other, for example. IXL was great for practice and did allow the teacher additional flexibility to work with students who needed more help or a more personalized approach, but I would not want my students to exclusively use it.
So they fall into a water-logged end portal (negating the fall damage) but why do they immediately teleport back to the overworld instead of onto the end platform? Mods?