Yes, I think thats true possibly Lynn.
I just like the feeling of solidity, longevity, and weight is always a good thing in wind prone areas.
One scratch in hypertufa would go unnoticed.
This styrofoam concept is an ingenious concept for the short term and O.K. for a quick look in my mind.
Create one for a friend as a gift;...pin a bow in the side,... and know they will move the plants into something better eventually if they are really into plants of course!