Ubiquitous learning is an easy affordance to overlook, but there are some real advantages here that I believe are really crucial. One is the teacher's allocation of time. Often we focus on the student and flexibility, but what we miss is how much less the teacher is having to focus on "keeping engagement" and more on "providing feedback". For engagement, it's easy to review a student's work ethic simply by reviewing their stats and posts, but it's not totally needed. In a live class, students who don't participate are a distraction for those who want to. Online, they're simply invisible, so their level of involvement is more so their choice.
For providing feedback online, teachers can spend their time now enhancing those who want to learn and/or participate. As they say about bringing a horse to water, it's often better to supply where there is demand, rather than the other way around.
I see it as the teachers get to do more teaching and learners more learning.

Also, because of recursive feedback, the needs of the teachers to give feedback are hedged greatly. Without so many forms of feedback, teachers only have to give out so much personally, which means they can focus on quality and avoid burnout, and so on.
Getting to focus on the quality of feedback get's the teacher's focus from meeting a high quota to focusing on what the student needs to hear, and student by extension. The difference between this and university classes, where students get basically no attention, is astronomical. It's also very disheartening for how professors would actually get better results by talking with students all period, rather than lecturing. The class size can be daunting this way, especially in the short time block provided, which brings us back to why ubiquitous learning is so incredible, being able to transcend those limits with ease.