One purpose is to enable you to concentrate on work, but I am don't think that's the biggest win. The core idea here is to use physical space mapped to mental space so you can move between activities easily. It can be a specific corner of a room too. Like - "when I sit here I'm ideating, when I go there I'm designing, when I sit at that desk I'm coding" sort of split. You don't need to be fine grained, but it is similar to "when I sit at the dining table, I eat". Quite possible to design this even in small spaces.