Expansion / contraction / Rots away.High maintenance compared to metal.
I have got a very nice looking automatic single wooden gate that shuts off vehicle access to the rear of the house. At least three times a year I have to go out and adjust / move the locking system / hinges because it will not open / close.
Where it expands / contracts.
It needs painting very regularly. Costs loads of £ for paint
A metal gate never needs adjustment.
My main metal mount P.V. System is now 14 years old. It has never been painted / had any problems.

Todays 6 panels were mounted on scaffold tower bits.