Is a central 12V/DC power supply for LED light strips useful?

Hello friends of the light ;-)

I want to work with LED light strips in most rooms of a new building. Instead of hiding small transformers everywhere, I was wondering if it would be technically sensible to install one central transformer per floor and lay a separate 12V wiring with a switch per room. Advantages from my point of view:
- Less power loss due to central transformer
- Easier to install and maintain

What do you think of the idea? Has anyone done this before?

No, that is neither sensible nor effective.

You will have less power loss due to only one transformer, but then you have to compensate for the higher power loss caused by the necessarily longer cables with significantly thicker cross-sections, thus unnecessarily wasting money and potentially creating other problems such as interference since the cables act as antennas.

That is simply not done, and that is why there are hardly any examples of this approach.