I work indie atm.
The point is that you have to choose what you put out. You have to halt your actual work and consider what's good enough to be shown. And whether it actually fits what you want to say.
If all you want to say is "George is atm doing our animation tree", fine, screencap the animation tree. If you want to show world 3 is coming along, you have to choose a good motive to show that. Uh, but maaybe without the skybox in it, we don't want people to complain about that everywhere. And could we have a character in it? People love characters. Huh, but maybe not the bee one, we want to keep that a surprise.
Seriously, why do I have to explain that some kinds of work cost time, not because the actions to perform them take time, but because choosing the right actions does. Only because you can type twenty pages of text in an hour you can't create an actually well-written short story of the same size in that time. Just as you can't necessarily decide on a good, representative screenshot in the time it takes to press contr+print. This is a no-brainer. The fact that the Camelot example you provided uses wip screenshots and content by other people does not strengthen your point, but instead shows the fact that it's not applicable on Playtonic's situation.