That's a pretty bad example to choose to suppport a 'for' argument I think! I wonder how many motorists have suffered a snapped belt and the associated cost and damage, it bends my mind that a device can be fitted to an engine which when it breaks (frequently before its service interval) will cause enough damage to virtually write off many engines. It also seems that many manufacturers are now reverting to the good old chain too (my Mazda uses one).
Of course chains can break but not normally within the kind of interval in which a belt will and will usually give some indication before they go. Mind you I think you can write off a Fiat sometimes just by looking at it funny!Anecdotes aren't data, but my folks had a Fiat that broke its timing chain, totally trashed the engine.