Imagination is invaluable for the writer. There are other things that are necessary, too, of course. A good grasp of how your language works, a knowledge and appreciation of what has gone before, and an expansive vocabulary are all important.
But without imagination, stories go “thump.”
Now, the statement in the picture might be a bit more extreme than I’d say it. Twenty items for a box might be far more than you need to tell a good story — or it might be far less, depending where your imagination leads you. But if a box is a box and never anything more, perhaps it’s time for an imagination tune-up.