Living supports have finite load capacity.
Promising · costly if ignored → warn
How it works
Mechanical load on a living stem.
What to do about it
Put fewer vines on the living support, or use a built support — a cattle panel is effectively unbounded.
How much it matters: Sunflower approx 2 vines/stalk; corn 1-2; cattle panel effectively unbounded.
The evidence
Evidence: settled without a trial - mechanics.