Unfortunately it's well known FP don't deliver on their guarantees. On the general issue I don't really see the answer unless the item is small enough to courier back to the manufacturer and has sufficient value.

There were a surprising number of Raymarine autopilot computer failures out here. Raymarine said send them back, couriered a new one in return and picked up all costs. That's rare though and many things are too big. We had an instance (in Venezuela) where we had to pay the courier to return the item and the cost was more than the item.

You are right about testing but I wonder if it might be worth a "what kit broke/didn't break on your boat" thread.

I suspect a number of manufacturers would feature highly on the breakages (FP generators, Jabsco toilets and Simrad pilots for a start). And a number would feature highly on the reliability (e.g. for me Hydrovane, Icom, Lofrans) But would the mods allow such a thread if it it includes naming and shaming