Because it's geared towards downloading applications, not embedding videos. Because there's none of the workflow - nor the scope for it - that you want to ensure high quality tutorials which are well categorised. Because it doesn't meet the desire that other people have that there's the option of a plain text transcription of the video, improvable and correctable by anyone (including its hiding if it's rubbish and written for the wrong level of user). Because it's a midgard module and the number of people able to, or willing to, write or amend another is very very small.
We can make the wiki look like however you want: