@ Ancient Observer ... indeed, and I was wondering when that CC topic would be raised over here!
It certainly offers a partial explanation for the marked variability of service standards in CW. Perhaps the popularity of working in WT+/WT is related to the simpler "beef or chicken ... here's your foil dish" style of service? Minimum work for those on the highest rates of pay, due to their seniority?
There are a couple of FlyerTalk threads going at the moment on that very subject ... great crew in CW in one direction, and poor going the other way. For SLF paying premium prices for premium cabins, it seems bizarre [but typical] that the least senior/experienced staff aren't providing services there.