Answer:
you can argue either side.
Explanation:
if you're going for yes, their play should be unstructured... you can argue that unstructured play can develop their character independently. you can look up why free play is good for kids.
if you're arguing that they should have structured play, you can say that imagination is good and all but the kids should have a topic to what they're playing so when theyre playing they also learn things that are helpful in the process.
if it is an essay, be sure to use a counter argument in one of the paragraphs. (arguing the other side)