Something goes wrong, I yell at them -'Fix it'- whether it's their fault or not. You can only really yell at the players you trust.
Suppose that insect wings developed primarily as thermoregulators and then were used for skimming and finally flying, evolving along the way. What would they be "for"? Or what is the skeleton "for"? For keeping one upright, protecting organs, storing calcium, making blood cells. . . ?