No one ever pays for consequential damage and very seldom anything towards labour costs
Agreed...but, it's ain't much of a safety blanket is it ? A real case of
"If we do sell you a dud belt and it breaks ruining your engine then tough ****, your own fault for having trusted us to actually make a product that was 100% fit for purpose"
I think expecting consequential damage costs is very reasonable as long as you can show the item had been fitted and used according to recommendations. After all if they make the belt and have pride in their product at the very least they should have some sort of insurance against the "odd" dud failure.
Unfortunately i think some(all ?) of these companies are solely interested in profits and the number of failures is bearable along with the associated bad press compared to the cost of actually caring about your customers.
As to my BMW 320d (now departed anyway) the garage actually assumed full blame as it was them that chose the belt kit and they paid for all the remedial work needed, thats a decent bit of customer service.
As to why it isn't widely known about QH belts....well when i went looking for a cambelt kit for the 156 (was gonna do it myself) EVERY local motor factor said the same thing - "DON'T USE A QH KIT", must be some reason. They almost all said use a Gates kit.
On another subject slightly, when going to order a new thermostat the local motor factor who knows my car is well cared for said to me - "Sorry, i only have a QH one listed, you still wanna order it ?"