The debate is about who should determine the design and choice issues in the way students learn - Siemans says:
Open standards (or software) and APIs enable mashups and re-creations beyond what initial designers had planned. The end-user, not the designer alone, determines what can be done.
and goes on to argue that:
Too much of our learning is being designed as if the choices of the learners didn’t matter. We design LMS’ to lock learners into our format, our model. When the learners leave our institution, we eliminate their choice of further access to learning materials. When a learner would like to demonstrate competence in a certain way (for assessment purposes), we instead require a 2000 word essay. With education, the design of learning should follow a similar model as with any other design process: namely to balance the needs and intent of the designer with the end user. In terms of educational design, the choice has traditionally rested with the institution.
He suggests that this is the attraction of social software:
The draw of blogs, wikis, podcasting, video logging, social bookmarking, and other social tools for educators arises from direct observation of what happens when learners are given choice. It’s enormously motivating to watch learners learn through dialogue - forming connections with learners and experts beyond the walls of a classroom (or LMS)…seeing passion replace routine, engagement replace passivity.