Disadvantage if using a flannel board as an instructional material ?

One disadvantage of using a flannel board as an instructional material is that it may be limited in terms of the types of content that can be displayed. Flannel boards are typically used for displaying simple images or shapes, which may not be suitable for more complex or detailed information. Additionally, flannel boards may be less engaging for older or more advanced learners who may prefer more interactive or multimedia-based instructional materials.