New single-family house in southern Germany

If the house is technically in good condition/well maintained/no renovation backlog and not messed up in any other way (choose one of these) it will find a buyer. If a missing bathtub prevents a sale, it could equally be another "missing" feature or different taste, etc.

But you can also see that individual lifestyles shape us. For me, the bathtub in the bathroom is like the stove in the kitchen. The latter is easier to retrofit, the former not so quickly. My parents have not taken baths for 40 years, my husband and I about twice a week on average.

Infrared cabin

That also occurred to us. I wanted to have one last year, we both liked it, somehow the economy has to make money off us. ... what happened? Nowhere did we find a sensible place because of the sloping ceilings. Then I googled what the thing is actually good for (better late than never ;)) and realized that our bathtub replaces exactly that. Or the other way around: if you don’t have a bathtub, then if you need warmth, install an infrared cabin. Only: then plan accordingly. P.s. My granddaughter is bathed almost every evening, it’s part of the calming ritual. So much for only Saturdays...! Saturday bathing ritual for children, my mom told me about from her childhood days, was like 1950-1960 ;)

Is there actually already a floor plan after 30 pages of discussion?

Bathtub and infrared do not serve the same purpose. Especially when you are not feeling well. I have both, don't want to do without either.

With a cold, straight into the bathtub, nothing better. Except ......, without a cold, straight into the bathtub.;) If you don't want one, then don't have one. Still, it's standard and I assume that an apartment/house without a tub is harder to rent/sell than one with, no matter how "nice" it is. You also don't necessarily need 2 toilets in a house, yet most of the time you do have them.

Bathtub and infrared do not fulfill the same purpose. Especially when you’re not feeling well. I have both, wouldn’t want to miss either of them

I can understand that, we will have a bathtub and a sauna.

When you have a cold, get into the bathtub, nothing better than that. Except ...... , without a cold, get into the bathtub.;)
If someone doesn’t want one, they shouldn’t have one. Still, it’s standard and I assume that an apartment/house without a tub is harder to rent/sell than one with, no matter how "nice" it is. You also don’t necessarily need 2 toilets in a house, but usually you have them anyway.

You like going in circles, don’t you?
You claimed that regarding LATER HOUSE SALE one should install a bathtub!?!
If THAT ALONE was the reason—i.e., selling a house in X years—I wouldn’t install a bathtub just for that if I don’t need it myself.
We ourselves have a bathtub, a second bathroom plus a guest toilet, I appreciate that kind of thing, and the "best wife of all" (Kishon) wouldn’t want it any other way.
It wasn’t about the pros or cons of a bathtub but about your incorrect general statement that a house without one sells worse (which I have just experienced exactly the opposite). There is nothing absolute, some people like bathing and some like showering; my statement is that I build what suits US and not for the generation after next. I also don’t store shoe collections in the basement or attic to sell along with the house ;)
Once again my attempt, THAT was what I replied to:

In case you ever want to sell the house at some point, it could have a negative effect on value, because for most people a bathtub simply belongs there

Please read and quote exactly, otherwise you just go in circles.

Please read carefully and quote exactly, otherwise one just goes around in circles.

I want to clarify: I would never want to do without a bathtub in my life. Also in case you might sell the house someday, it could have a negative impact on the value, since for most people a bathtub simply belongs there, and installing one afterwards is probably a bit more difficult. I hope this settles the matter, as we are really just going around in circles now.