I would like to see a nation whose laws are limited to what people can remember.

Ie. In a court, a jury makes their decision about if the accused has broken the law simply on their recollection of the law.

In turn, this means all rules must necessarily be far simpler and less precise.

Lawmakers wouldn't write laws so much as advertise what they think the law should be, and if the population remembered and agreed with the new law then it becomes the law, since that would be what the courts are enforcing.