>>7485456>>7485459>>7485558>Figures that get joints are sculpted with them in mindThat's not necessarily true. Look at the early Revoltech Predator sculpt for example. I also strongly suspect that Yamaguchi sculpted at least part of Spidey this way because of the strange interlocking way the knee area works.
It definitely seems to differ from company to company, and even sculptor to sculptor within those companies.