Sometimes would be fine, you have one week and in some cases it is enough, but think in the following example:

You upload your wedding video, or a video with you and your gf playing guitar. A year later she cheats on you, and you don't want to see her face ever again. Well, you are out of luck, because dtube will make sure that you never stop seeing her in your channel... "My Wedding
Best Day of My life!", with a glowing tumbnail of you two kissing...

I could think of another 50 examples of why somebody would want to delete a video or a post after a week.

The only solution would be letting us delete or edit a post whenever we want, or steemit has to teach us to see the future, so we know which post we will want public for the eternity.