Those things (video, etc) are:
1. Done on apple computers
2. Have an infinite variety of interesting (!) technical hardware/software issues to discuss.
I agree with you that writing matches (1) but I'm not so certain about (2).
There are forums out there that deal with the struggles of wrestling Word into submission, and the tips there also apply to Word on Mac. I don't think there's many mac-specific writing technical problems. If you want writing criticism and feedback, again, a more specialist forum might suit you better.
Interestingly, we have no DTP (desktop-publishing) forum, and that used to be a *HUGE* area for Apple.