I will not write much because my English is not good. If someone wants to develop this concept better, be my guest. I have an idea for how the topics are displayed. And there could be several options.
First, the simplest: description for all topics.
Now, more complicated: the fully open topic
This last option could work as blog too. The homepage would become more attractive. And for people who feel lack of images and thumbnails, this problem would be solved.