Two things :
1) Suzie, PPRUNE stands for Professional Pilots Rumour NEtwork, nothing about CC in there, hows that for patronising
2) If the tech crew deem it safe to start cabin service, what right do the CC have to override that ? Other than the obvious answer of turbulence.
Some pax, especially J and F, pay a lot of money to be sitting there, and rightly or wrongly, don't want to wait that extra 5-10 mins for their feed and drink.