Can't recall a properly maintained 164 TS requiring a chain before the engine wore out some way beyond 200,000 miles.
A few cars have badly designed chains. They are the exceptions. Nissan Micra mk1 broke chains, Ladas had chains made from linked spaghetti hoops, Stags had single row chains that stretched.
The big advantage of a chain is that in most situations, if it is starting to go wrong you get plenty of warning before it gets critical. Not so with a belt. Also I can't think of a worse enviroment for a belt to operate. Heat, grime, oil, spray. All of which knacker the roller bearings and degrade the belt itself, which also suffers fatigue. Chains by comparison bath themselves constantly in freshly filtered hot oil (This is not any oil, its M&S Oil
)
You get my drift
AlfaLincs