Floor plans for a single-family house 160 sqm - Your experiences?

We have a side entrance like that, but not because we explicitly wanted it that way, rather because it happened naturally in everyday life. The side entrance to the utility room is closer to the street and under the carport for us. The advantage is that it really serves as a dirt trap. We keep all the shoes there, including the running shoes. The jackets are then in the actual hallway, which we only walk on in socks or slippers in everyday life. The utility room has tiles, the hallway has a wooden floor. When I look at how dirty / sandy the utility room often is, I’m glad not to have that in the hallway. However, this does mean that the utility room is indeed not suitable for me as a laundry room. That just doesn’t go well together. We have the washing machine and dryer upstairs in the bathroom and find that great.

One more question about the bathtub: You already have a 1-year-old child. Is the child actually not bathed but rather placed/stood under the shower? I can hardly imagine that in practice.

We have a side entrance like that, but not because we explicitly wanted it that way, rather because it just happened in everyday life. The side entrance to the utility room is closer to the street and under the carport. The advantage is that it really serves as a dirt sluice. We keep all our shoes there, including running shoes. The jackets are then in the actual hallway, which we only enter in everyday life wearing socks or slippers. There are tiles in the utility room, wooden floors in the hallway. When I look at how dirty/sandy the utility room tends to be, I'm glad not to have that in the hallway.

You have it in the utility room for that reason. Where is the difference? I'm not quite clear why the entrance area has to be a highly clean cleanroom that can be accessed wearing socks, while it can be sandy and dirty in the actual laundry room. It becomes even more nonsensical when both rooms are directly next to each other as in the example. The crucial point, in my opinion, is that each room should be given its function and not some imagined ideal. An entrance can also be dirty at times – it should be able to handle that. I could still understand if you have a large dog that should walk through the shower directly after a walk before being allowed to enter the house. For such purposes, however, an outdoor faucet is much better. Also, for very dirty children, it seems wiser to me to create a spot for removing shoes outside the property rather than bringing the dirt inside at all. In the past, there was the covered porch for that.

We have a secondary entrance like that, but not because we explicitly wanted it that way, rather because it turned out that way in everyday life.

Many people want the secondary entrance. And there are also houses where it is well implemented. But if you plan a parallel corridor next to the actual entrance, which apparently takes up more than 2 sqm, then it is an implementation done just for the sake of having it—regardless of whether the location makes sense or not. When I consider that I enter the utility room approximately 4-5 times in the evening without turning on the light, then the transfer of dirt simply doesn't make any sense.

One more question about the bathtub: You already have a 1-year-old child. Is it really not bathed but just put/stood under the shower? I can hardly imagine that in practice.

Especially when you have 3 children who never get to experience the fight over the submarine in the tub, while the brother sprays you with shower gel. ;)

Now for the constructive suggestion:
The wardrobe should be near the entrance door to keep the dirty zone as small as possible. Also, muddy shoes do not belong where laundry is washed. All in all, the architect can improve and implement this here.

We are definitely sure that we do not need a bathtub,

if you don't shower at the moment, that's one thing...
But also consider that a tub is not only needed for bathing (I also find it strange to put children in a basin in the shower).
In 5 years you might need sitz baths, want or have to deal with a base bath, soak a wool blanket, keep a fish alive, finally eat fresh kale that needs to be washed there, soak a carpet, and so on and so forth.
If there is an open space, then it should also have a window. How is that supposed to be implemented there?
Whether the island is sufficient for working in the kitchen remains to be seen. Personally, I would find there to be too few west-facing windows.
In general, I would probably mirror the entire plan, but leave the kitchen in the west. The utility room with carport is in the west location like pearls before swine.