Floor plans new houses & chalets

Me and my SO are informatively looking for some new houses or to be built houses and chalets in in Valais and Vaud, and what caught our attention on the floor plans is that sometimes there's a small (visitors) bathroom in the living room, always with a at least a toilet and a small sink, sometimes also a shower. Example: https://www.immoscout24.ch/acheter/3003137910

Here also:
– https://www.immoscout24.ch/acheter/4001008064
– https://www.immoscout24.ch/acheter/4000769616

In Belgium at least we'd put a visitor toilet more near the main entry door as far as possible from the living areas and kitchen. I recall in France and the Netherlands it's also more common to not have a bathroom in your living room… And certainly not next to your dining or couch area.

Is there any specific reason for this? Is it a Swiss thing?

I haven't talked with real estate agents or architects about the matter, but I hope for a new building at least we could cancel that or reposition some rooms with some more logic. Unless obviously there's some Swiss logic, I don't know about yet…