That will last until you are married and have children.
If you can tell your potential employer that you can fly to country X any time as you just put all your things into a single suitcase, it makes it much easier to relocate for jobs around the world.
Once you settle down and have family / children, obviously you will probably stop moving around and probably stay in a single place for a long time and only move once in a decade or so.
Even if you keep around some stuff that are not vital but ‘nice to have’, maintaining a restricted set of things that are enough to live your life if the whole family had to move without notice helps for peace of mind.
Of course, YMMV, but in my experience life is generally less simple once you share it with other people.