Well, you're right about the "lazy" part here, but it's not only that. For now these are not finished components and the previews are as well just quick and geeky updates on what's going on. They generally take less than an hour to make. And, at this stage, this is as much as we can afford spending.

If we were to make proper "tutorials" they would likely be narrated, just for marketing-sake as you suggested. I would, however, try to avoid narrating actual explanations on what's see more going on on screen, since we really want to make it self-explanatory.

In short, I think you've got a fair point, but these are not "products" yet, so they're fine as they are.