I've yet to use a Learning Platform or MIS that wasn't tortuous to use and ended up generating more work for me than if I had simply used pen and paper.
The trouble always seems to stem from a lack of understanding of what teachers actually go through in a given day, whether it be setting and assessing work for students, tracking and monitoring performance, or reporting back to students and parents.
It's telling that the most effective way I found of having students submit work to me and for me to provide feedback, targets and grades was using GitHub. This is a product that is used internally within the organisation that produces it, and so works (almost) seamlessly.