Fair points. I might choose another presentation for the category pages, maybe boxed or something like that.
I have another question.
Is it possible to have category pages (which contains topic lists) being displayed in tiles on mobile, but with thumbnails on desktop? I tried several settings tweaks but I couldn’t achieve this.
edit: I achieved it. I’ll detail how I did it a bit later in case it could interest someone else, I added this edit just so nobody spends time explaining me how to do it 
So, If I’m not mistaken, here are the settings…
First we need the tiles display only on the mobile view of (at least?) a topic list:
Then the thumbnails for desktop AND mobile:
I was mistaked at first because I thought “tiles” and “thumbnails” were two different presentations of a topic list, both containing the images. but this is not the case. Thumbnails are needed if you want images to appear on a topic list, whether it’s a tile or not.
There is no need to manually add your categories here:
Since we’ll override this setting by enabling the following one:
Now, you should have small thumbnails on desktop in any topic list (latest, a specific category, etc), and a “tiled” presentation on mobile with large thumbnails:
