Why would people think that a clutter free house means that they have no belongings??
We have loads of "stuff". It's all put away in cupboards, drawers, etc behind closed doors. I don't see why I should parade it and shove it under peoples' noses to "prove" I have personality. It includes all kinds of keepsakes, a music collection, lots of books, etc. But it's behind closed doors. That way I know where it is, it's kept in good condition (i.e. not fading due to sunlight etc), not gathering dust, etc.
It'd drive me insane if it was all on display on shelves, window ledges, etc. I'd be constantly dusting it all, having to keep moving it to wipe the windows and surfaces, etc. Nor do I want to be constantly tripping over stuff placed on floors etc.
"A place for everything and everything in it's place", which for me is neatly organised in drawers and cupboards and window ledges, shelves etc - minimalistic with just a few items, such as a couple of pot plants on the lounge window ledge and the odd family photo/portrait on a few walls.
Makes it so much easier to clean around and also easier knowing where things are rather than constantly wasting time looking around for stuff.