I kind of agree - but there is a whole world of quality fizz that is not champagne, and costs peanuts. Indeed some airlines serve it in Y...
So perhaps everyone would be happy if WTP got a welcome glass of high quality sparkling wine / cava / prosecco and Club / First got champagne? Only whinging would come from Club when it's been worked out the fizz in WTP is better than the champagne they get served!
EDIT - ah so it is Sparkline wine, not champagne - wasn't clear at first