Hi Blizz, Like @theDeugd says (and is shown in image 1 and 2), there is definitely a 'mark all is read' option.
I am very sorry to hear we come across as 'lazy', I would have hoped by now we would have made a different impression..
You can still look at the overview by clicking 'topics' and you have the mark on the left.
That is valuable, no? Plus the filters offer you a lot of options too!
Anyway, we will take your advice at heart and see if we can add it on the categories too.
Would you happen to have a suggestion on how?