are you sure lower quartz content means more prone to chipping? on the contrary i would think higher resin percentage should logically result in a less brittle material, as quartz is the hard but brittle component, while resin is the soft but flexible component.Chipping is not suppose to occur so easily for quartz (compared to sintered or acrylic). That means their mineral/resin blend is probably low 80%.
Then they should jolly well know that customer complaints and claims on warranty will be higher and have to factor that into their operating costs (i.e. the Prism+ model for monitors). Therefore newbie has the right to claim on that warranty or demand full slab replacement.
thats my 2 cent.
in any case, you need to better understand how typical warranty terms and conditions work. and paying for an inferior product and expecting the performance of a more expensive product doesn't make any sense.