I used to think that coil was important, til I did some research on why it was there and why it's been discontinued from most current-production hoses. The coil was there so the hose wouldn't collapse during the vacuum-and-then-rapid-fill cooling system fill-up procedure used at the end of the assembly line. Once the car is operational, the only reason why the lower hose would tend to collapse is because of grossly excessive pressure drop across the radiator (i.e., the radiator is clogged). This is the case even if you are running an exotic coolant (the waterless type I use) which does not operate under pressure, and it is even more the case when you are running with a normal pressure cap that tends to keep all the hoses well "inflated".

Soooo, if no coil and you get lower-hose collapse, service the radiator!