Instructional design is a deep, respected practice that is rich in history, theory, and research-based methodologies, yet it holds a significant amount of grey area and is complicated enough to result in a lot of misinterpretation. It is not an easy discipline and requires research and evaluation on a regular basis.
There can be more that one successful or "best" approach to design for any given project. There are necessary pieces for learning, and there's nice-to-have pieces. Flashier does not necessarily mean better, and simple does not always mean boring. But learner engagement is paramount and modern attention spans are a battle. There are many factors to consider with each new project: complexity, audience, budget, expectations, safety, accessibility, and so much more.
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Edumorfosis
Very interesting.