A few thoughts from me, independent of the very justified comments from the previous posters.
- I would miss possible walls for cabinets, dressers, vitrines on the ground floor. If the tidy impression is desired, OK. But you have to want that.
- I really like the parents' wing if it were built like that. The walk-in closet can be left as it is and would exceptionally deserve that term in this extent. Otherwise, solutions here are often called "walk-in closets" even in upscale circles.
- What I really don’t like are the two tiny rooms, like the office and utility room. 2m rough width feels too little to me, since for ergonomic reasons I wouldn’t put the desk by the (south?) window either. Either it’s almost always shaded there or you get blinded.
- I understand that you want to work in the attic (studio), on top, if there will be no sauna. In that case, I would point out that the way to the kitchen is very, very far. In my rented apartment, I enjoy going from the screen with my headset during long calls to the kitchen to get a bite to eat. Here that would really be a long way.
- If basement, then properly and not just some makeshift room. Despite many square meters, you don’t have much storage space.
I would also seriously question the budget for this project. When did the architect last build a house and how accurate was his cost estimate? Especially in the current market environment, I would be concerned.
I find the HQ-Extrem idea very prudent, but it is not cheap.