Floor plan design: Single-family house; 140 sqm; without basement; 730 sqm plot

I’ll go back into reading mode for now and will get in touch when there are new drawings from the architect. Thanks to you, we now have a long list of things we first need to clarify.

That is a very good idea. For me too. Hopefully you can sort out the defects shown here well and pass them on to the architect.

I would find it very regrettable if the OP were to try to work through a defect list of question marks with the architect instead of finally demanding transparency from the architect in order to understand his design intentions. An architect must be able to explain his concept to his client so that the client, as a layperson, can evaluate it. Simply bringing a confusing staircase to the correct length and straightening it is not enough.

Just because I currently have a good salary doesn’t necessarily mean it will stay that way until retirement. [...] (although I don’t even think that children's rooms necessarily have to be >14 sqm).

Full agreement.