as it would make things easier to digest,
That's the thing hubski wants to avoid. If you stick around long enough, you'll start to notice how most of the content posted here are long articles, and the comments are in-depth discussion. Rather than the image/meme-filled reddit, like you're used to.
The reason for no thumbnails is to avoid having people simply post a bunch of pictures/memes, and instead focus on good articles.
The idea is to have less content, but more thinking about it. Rather than ADHD reddit.