To say nothing of the goals and activities that come with 'grown-up' life and having a family, that don't map well to "everything fits in one suitcase."
Does family bonding really happen when everyone is staring at their own tablet? Cooking and baking are universally recognized for their family benefits going back to before written history. Parties don't happen without at least furniture, glassware and music. Play dates and sleep-overs? I guess if every kid coming over knows to bring their own stuff... What about gear for hobbies? An easel? A dremel? A drill press? Or what about vacation concerns like a fishing-pole or snowboard? Pets? Running shoes? A tea kettle?
Minimizing clutter is a great thing. But absolute minimalism is really only achievable by the young, healthy and single contingent that have seemingly no ambitions or interests beyond heads-down work and/or meditation.