Thank you for your feedback. Let me address your points one-by-one.
First, writing on the board is a pedagogical tool. That is to say, it helps many students learn. Obviously, you are a highly competent user of English. This is not true of many of our students. Part of success on IELTS is critical thinking – I ask you to think critically and ask yourself why we would aim our learning materials (directly) at high competence users? These users are far less likely to use our materials in the first place, and doing so would impede the learning of lower to mid level speakers – exactly the type of English user we are trying to help!
Second, the forum does seem to lack a search function. We will look into adding this in the future.
Finally, I understand your point about the video. When I visit the site (which is a lot!), the first thing I do is pause the video! You can pause it simply by clicking on it.
Again, thank you for your suggestions. All the best.