>Gray is used for many reasons in new builds, its a neutral color, and because many builders build a house/apartment, THEN sell to customers. Very few customers buy a plot of land, contract an architect, make customizations, and then build the building. It comes with the realization that people will substitute out the things they want on their own, not requiring someone else figure out everything they like and being creative all on their behalf for $0.

Interesting. Here in Poland when you buy an apartment from developer, you generally get it unfinished, like this: https://www.domoweklimaty.pl/app/uploads/2018/10/co-dokladni...

It's up to you to find contractors to finish it the way you want it - maybe together with interior architect if you want one.