ᐅ Cracks in aerated concrete blocks—are these merely cosmetic defects?

After the completion of construction of our single-family house in 2014, we noticed cracks relatively soon afterwards inside the building, affecting the exterior walls.

In case it’s relevant, here is the floor structure:
1cm (0.4 inch) laminate
5.5cm (2.2 inches) calcium sulfate screed
PE foil
2.5cm (1 inch) EPS 035DES
6.0cm (2.4 inches) EPS 035DEO
0.5cm (0.2 inch) bituminous membrane
16cm (6.3 inches) reinforced concrete slab C25/30
PE foil
5cm (2 inches) perimeter insulation WLG 035
PE foil
Gravel

The walls are made of 36.5 PPW2-0.35 0.08 W/mK

The interior plaster has no reinforcement mesh (yes, this is a deficiency!)
The exterior plaster is properly applied.

I couldn’t detect any cracks in the exterior plaster.
Given that the interior plaster lacks mesh and no cracks are visible on the exterior plaster, I had assumed so far that this might only be a cosmetic issue.
Essentially, if the interior plaster were properly done, we wouldn’t even notice the underlying small cracks.

I inspected one of the two most severe cracks with a thin knife and was able to push it deeper into the wall — see photos.

All four exterior walls are affected, mostly on the ground floor but also some cracks on the upper floor.

What do you think about this?

Since the cracks are not visible on the outside, I consider them a cosmetic defect. There is no paint fleece or wallpaper covering them, so unfortunately all the shrinkage cracks are clearly visible.

Wait until the house is dry. Apply filler. Paint.

The house is definitely dry; we moved in 7 years ago.

When renovating next time, seal the cracks, and that should resolve the issue.

It happens. If you don’t have fleece or wallpaper on it, settlement cracks will eventually become visible. We have them too. That’s the charm of plastered walls 🙂