I would like to note, that DPI of the file is important as for the overall document, it makes difference for vector graphics/fonts.
It still doesn't mean the raster graphic need to have such large input. 17meter billboards are not shot with latest medium format PhaseOne just because the print is large, or in panorama mode to get more pixels into single photo.
The photos there are in 95perc. never more than 24-50mpx in origin (shot on regular full-frame SLR), so 8k render is enough whether it's 2 meters or 20 meters. Even the AI upscaling is fully optional.
Just because we can (in rendering compared to photography) doesn't really mean we should or have to. Enough CGI guys get suckered into this uneducated nonsense and soon enough it will be requested regularly. Let's not make this a thing !
