Building a house, is it necessary to combine the bathroom with the toilet

During the construction of the house, the question often arises to build a bathroom with a toilet, or separately. There are many opinions in this matter. On the one hand, reducing the number of bathrooms, the useful area of ​​the house increases, this trend applies to both the apartment and the house. But on the other hand, the combination of these two rooms threatens with skirmishes between households.