According to Brickset this set's shelf life was:
LAUNCH/EXIT01 Jul 2008 - 31 Dec 2011
I have 42000 set from 2013 (and some others too) which still use stickers with arrows like one of your pictures. So it wasn't until few years later currently used stickers (with production week marked) have been introduced.
I am writing an answer as though the question were posted in English, though as originally posted it is in Dutch.
The intent when making a model is to capture the important features in a way that the model strongly reminds people of the original. Buildings have features such as overall shape, colored/tinted glass, and concrete or steel columns and beams that ...