Some things never go out of style.
A few observations on these revivals of medieval style defenses.
Being able to rent a bulldozer instead of using a work gang of men with picks and shovels makes the private defensive earthwork affordable to the common man. Also, installing these in advance of construction would involve moving a lot less dirt, and you'd get a better view. On the other hand, in the twenty years between massive floods, you'd need to climb a lot of extra steps to get to your front door every day