Such. Good. Points! I'm a writer, but I also have a background in film. I prefer to read written posts, for the most part, for many of the reasons you've stated. I also prefer to WRITE posts for the same reasons. I find it easier to edit my words than to edit my video, or get it right the first time.
If someone's video doesn't capture me from the get-go and hold my attention the whole time, I'm not going to make it to the end. Yet I can skim a post quickly, pick out the info that is relevant to me, and get more out of it than many video posts.
I'm not saying I don't like video. A powerful, professionally produced video (even if on a smartphone) can be way better than rambling writing. It's a balance of choosing the right media for the message, and delivering it as clearly as possible. Great post!
Well, you have a background in film so I would also expect you to understand the value of editing... and the fact that you need to make your point in about 2-3 minutes, OR have a supremely intriguing intro that really captures people.
And then, of course, there's the length thing. As writers we know the dreaded TL;DR... but video seriously needs a TL;DW for long rambly assemblages of "personal-thoughts-while-stoned." For the most part, stoners make really poor videographers. Just my opinion...