There is a balance that has to be struck between letting the child have some freedom of what they put in their room versus the standards of cleanliness and organization expected by the parent.
Some parents will choose to clean to room themselves, have a housekeeper do it or just let it be and “hope” that the child will form better habits on their own down the road. Those are all REALLY bad strategies and will most likely cause problems down the road.
It is unlikely that any parent will ever think that buying a new house so the child can start off with a clean room would be a good idea.
We see contractors every day though that expect that buying a new shiny tool, truck or piece of software will solve discipline problems. For example; if a project team has poor document control disciplines then buying software like Plangrid which is an excellent tool will simply create the same mess but in a different format.
It is lean tools like 5S that solve these problems at the organizational level. Remember that it will always be PEOPLE >> WORKFLOW >> SYSTEMS and not the reverse.