Thanks for your detailed response. I can agree about photographs. Adding some text to explain the photography is very valuable.
In regards to videos, the value is in the video itself. Many high quality videos have very minimal text. I am glad that you have disabled word count for these posts. I make quite a few videos myself, I normally add at least a brief description just to give the viewer a rough idea of what to expect (though, I am not sure of my word count).
I generally like what you guys are proposing. I have yet to delegate any Steem Power as I like to have Steem Power available to curate good content when I see it. I also strongly believe the bid-bots are causing a lot of damage by pushing really low quality content onto the 'Trending' page. I do not see your services being abused in that way.
I will think it over for about a day and then decide if I should delegate any SP and how much if I do. I normally only post a few times a week as my posts are generally quite long (several thousand words sometimes).
Even if it is an amazing photograph or a well thought, shot and edited video, there is still a lot of benefit from adding a good description to it: