Floor plan design single-family house approx. 170 m² + attic as a modern clinker house

Consider whether you want to install a [Fallrohr] from the bathroom upstairs for the laundry to the technical room. We will probably do that as well, so the laundry is always downstairs right by the washing machine...

Yes, we are thinking about it. The ultimate challenge would be something unobtrusive from the hallway, so the kids also have easy access to it. Currently, we even have a laundry chute from the bathroom to the utility room, but we don't use it at all. We find it impractical to sort the laundry downstairs in the utility room. We pre-sort upstairs, simply using a 4-unit Kallax with 4 fabric drawers where we sort into colored, white, and cooking laundry (and a bonus compartment).

I had planned to wait for our architect, but that's easier said than done...

Using the space to the left of the stairs is somehow tricky. Too small for a normal room, too extravagantly large for the children's bathroom. The stairs at the bottom in this variant are now narrower and shifted a little to the right (the ground floor would allow that). Then you could accommodate a children's room there.
Of course, the hallway here would seem significantly less open, the window facing west would be gone. Maybe you could still get light through skylights in the bathroom doors.
The south-facing location of the bedroom now is naturally rather suboptimal; a children's room would certainly benefit more from that location. The space in the master bathroom is now, of course, luxurious; you could even fit a sauna in here.

Alternatively, you could move the children's bathroom to the right, and then extend the hallway northwards up to a window.

(Addendum: Yes, I know, the architect's design for the upper floor looks much better. However, the small master bathroom really bothers me. :D)

So, new attempt from the architect. Unfortunately, the "mega, this is how we do it" feeling does not set in.

That's a shame! I like it. What else do you not like?

So, new attempt from the architect.
Unfortunately, the "mega, let's do it like this" feeling doesn't set in.

And why not? What bothers you?
Spontaneously, I would do it like this: