I hardly know anyone who still wallpapers because they don’t like it. [Raufaser] had its time, [Glasfaser] had its time, photo wallpaper had its time, non-woven wallpaper has its time. And some do this or that, but “currently people (actually) don’t wallpaper.”
In general, we live in a time where everyone does what they like and want, without conforming to a trend. Only usually our taste is influenced from outside.
If you leave off the wallpaper, you have to expect that cracks will be visible. Do you have a ventilation system? Then I wouldn’t worry. I can’t imagine that the carrier layer of [Raufaser] should somehow hinder the moisture flow... it’s just fiber after all?!