Floor plan discussion of a medium-small detached house with a pitched roof & double garage

A dryer is only suitable for down comforters or jackets and sometimes towels. But not for normal clothes.

I wish for so many things too, but then reason wins… In #13 you write a lot about what you find less than ideal. To be honest? "Crap" (no offense intended) does not get better with a few small changes. I would start completely fresh in a neutral way. Have the architect work with your room plan (which rooms do I really need with which desired sizes) and your life rhythm. And don’t have them work on the floor plan you brought along. Preferably forego the basement, which is completely overpriced compared to its usefulness (as I said, a garage with an attached workshop is a pragmatic solution. Or you buy a drying rack for two floors instead of fitting three pieces on an area of 10k. Then I can just buy new T-shirts cheaper instead of washing. Think out of the box).

Well, what a builder doesn’t find problematic is not written on the sheet about what an architect should avoid.
You present him with something that originated based on "not problematic" or "little knowledge," etc. His role is to plausibly explain your nonsense and then improve it.
The usage plan is now rather far-fetched, without wanting to dispute that you don’t know what you want or need.
The questionnaire is indeed filled out, but there is nothing about a workshop or love of sports there.
If you plan a laundry room of more than 8 sqm in the basement, you should also mark the space for drying racks there.
The basement will be a utility basement, not a living basement. This means there is no living room there. Who is supposed to sleep in a room without heating and without controlled ventilation? The window has a light shaft. Once the terrace is set up, there will probably be an outdoor sofa on the grid, and the basement room will be dark.

Well, I don’t know what there is to discuss except if the tax office is interested. If you let one guest per year spend a night in one of the two rooms, that shouldn’t be a problem. You can lock away folders.
And you say it yourself:

The armchair can also be a sleeper chair, yoga mats fit anywhere. With the power rack, I have to surrender regarding spatial alternatives, but if you have a garden, you don’t usually go to the basement for strength training, because strength training is done in the garden anyway.

It’s not much concerning the house ;) Some things just don’t justify the fact that many things in the house aren’t quite right. You don’t have to sugarcoat the shower either. Even if you actually come home dirty, you tend to run upstairs where you can move naked rather than in the cramped shower-toilet. And if the main bathroom works nicely and “spaciously,” then it works for a couple too. Unfortunately, I speak from experience on that.
What else was there... the landing: deep enough so you can comfortably stand there. One step, at least 90 cm, larger as desired. It’s about minimizing accidents.
Most of what you like is also in a standard off-the-shelf house. I think it’s totally okay to tinker with the walls yourself, but play eventually becomes reality, and then you should pull the brake. Now your house planning has been brought into reality by the architect, where the upper floor doesn’t work, the ground floor doesn’t work, but in your eyes at least the basement does.
Do you also have a usage plan for the other floors?

Without knowing the exact dimensions of the plot and the ridge direction variable: I would orient the narrow side of the house to the south or make it a square. I don’t know exactly because I rarely design houses with closed kitchens. In this case, orientation and plot size are somewhat more difficult. I would pull the garage forward and place it in this corner. Behind the garage, I would put a workshop/storage room and create a connection here with the technical room. As I said: I would rather focus on living, daily work, and staying than on the basement and sugarcoat it. I would rather arrange an attic for nice-to-have things.
Kitchen maybe with a southeast corner window, dining area with enough circulation space around it, and a cozier chill corner. The landing staircase doesn’t fit the current house dimensions and is anyway a staircase form for larger houses. Here it dominates both floors due to its mass. It almost takes up 3 meters in depth. With 8 meters width, not much “room” remains.
The upper floor with your demands can probably adapt well, but not with these house dimensions.
Here’s an upper floor with a restrained staircase, outer dimension of the floor plan 8 x 11: children’s rooms (offices) also facing south, spacious dressing room and bathroom (originally with a sauna, here I have marked a walk-in shower).
Without children, I would plan somewhat more freely than in the family-house corset.

Out of pure curiosity, I would like to know why?

For us this applies for reasons of sustainability :)

The previous comments are full of described corners, edges, and already recognizable problems, and you are fixated on the price drivers garage and basement, which you have set in your mind. I keep reading sentences like "currently we also live like this and are satisfied," which then leads me to ask why build at all. I have to