The situation is different for the wildcats. You will see long, thick, heavy and well insulated tails on cats that do a lot of high risk climbing and maneuvering. Wild cat species that come immediately to mind are the snow leopard, margay and clouded leopard.
|Snow leopard tail - cropped image to highlight tail|
You won't see a better tail. Photo: by Marit & Toomas Hinnosaar
The snow leopard has perhaps the most impressive of tails. It is far longer and thicker than anything seen on a domestic cat relative to the size of the cat. This is because the snow leopard spends a lot of its time on 40 degree rocky slopes. And the tail is needed to assist in balance. The other two are tree dwelling cats.
This requirement applies to all cats. The cheetah, a ground dwelling cat uses its tail for balance in maneuvering on the ground when chasing prey.The serval has a relatively short tail. The serval is very much a terrestrial cat.
Domestic cats use the tail for balance too, but also for body language communication. See for example: Tail up.