As a faculty member at a large university…I have a deep respect for the impossible job of university IT departments.
We originally rolled our on LMS decades ago. When we switched to canvas we kept the home brew running for five years past its expiration date because faculty refused to remove their files. Finally each one was manually moved by IT for the recalcitrant old faculty.
They are large databases yes but they do a lot of small and large things that that analogy glosses over