I like chains just fine, but they're going the way of the dinosaur on commercially-produced treestands. I reconciled a good while back that manufacturers wouldn't be using straps if they were more prone to failure than a chain. Given the costs of litigation secondary to injuries, it only makes logical sense that a manufacturer (and TMA member) is using the safest stuff they can. Still...a piece of steel seems to look so much safer than a piece of nylon.
Some stand designs don't lend themselves to an easy swap-over to a chain. Some designs depend on the strap to ratchet the stand in tight to the tree for stability, and may be less stable with a chain. I don't have the answer, but I've learned that a chain isn't automatically safer. It is obviously more resistant to theft, but every stand I've had stolen was wearing a chain and padlock. Sigh....
As pointed out, Chippewa Wedgeloc is closing their doors, and confirmed this to me in an email a few days ago. I can't even think of a major treestand manufacturer using a good chain these days. Sign of the times.