As is it stands now, very few people have a clue about how to measure chain wear and get the most life from their chains and cassettes. The most common comment I get on this topic is that chains are cheap, so I toss them every 2,000 miles or less. Cassette life seems to be a little more concerning for some, but there again, most people don't know the trick to extending cog life (alternating the use of several chains).
So "most people" don't own a chain wear tool? I doubt that.
This reads from the perspective of a clear Shimanist, but Campy chain users get easily 5,000 miles from a UT chain without trying too hard. Shimano chains, you get what you pay for.
I don't think it takes an engineering degree to understand that cleaning and lubing a chain frequently substantially increases its life.
As for reliability, Campy does not have a track record of releasing parts prematurely, they work from day one. If this were SRAM or FSA, I'd be very worried.
We're only talking about a 10% difference in sizes, it's likely that manufacturing techniques have advanced far enough to make these parts affordable and just as reliable.
But 11 speeds? It's kinda sad that the group makers have basically resorted to gimmicks.