Hi,
our experience with two children (6+7 years) and plastered walls:
One son liked to scribble on the walls, no matter which room. The other son did not.
In the kitchen, living room, hallways, stairwell, and children's rooms, the walls were partly dirty, scribbled on, and had dents (indentations in the plaster caused by objects hitting the walls during play). The sensitive wall paint easily absorbs dirt from objects hitting the walls during play, or from dirty hands of playing children. Over the years, I was able to remove the stains several times with a damp cloth, but each time this also slightly removed the (water-soluble) wall paint, which partially caused permanent dark spots.
Last year, I painted over the spots with the original wall paint.
Wallpaper is probably not as sensitive to dirt and also covers the settlement cracks in the plaster. However, we did not like wallpaper at the time when building the house.
Regards
Michael