We must have the ability to CHANGE OUR MINDS.
With the level cap, and thus the imagination point cap, there's only so many points we are going to have.
If we spend them, and then discover that the result we have is not the one we wanted, if we can't reset, we've got nothing else to do about it.
If I buy lots of land, make lots of expansions, and then discover that there's something I wanted that I now can't build due to being full... I will be upset.
If I add another room to the house, let me take it down.
We can learn, we can unlearn, make sure we can unbuild and unimmagine.