Quite true considering today's students know when and where to access their study materials. You have examples of Byjus, urbanpro etc who follow the same scenario.
Screening same course across multiple devices without losing the features(navigation, adaptability etc) is the core strategy behind responsive elearning.
Mobile is where the concentration needs to be diverted with such huge penetration among today's millennials. They will be either on Android or iOS or Windows devices always and getting your course adapted among these devices is of primary concern.