On CX 253 3 weeks ago in Y, the flight attendant on our aisle did not come up and down with the tray of water or juice for 5 hours. (The FA on the other side was up and down every 30 minutes with a tray). It was impossible to nap with the barrage of call bells being rung, and aggitated passengers. When I did get the FA, she told me all snacks and beverages are "now on request". Luckily after the crew change when she went for a nap, service picked up to normal, and return flight was good. Maybe there is one rogue "now on request" FA terrorizing all cabins ???