Waste is in the eye of the beholder. Whether I make my burgers out of ground beef, ground chuck, with brisket, or veggie burger, some one can say there's waste. Whether I buy a $80 bottle of wine, or an $8 bottle of wine, someone is going to say there's waste. For a kid loads loads up a plate of food, maybe he went food challenged once before in his life, or maybe he has 10 brothers and sisters and he's conditioned to get as much as he can or gets some for a sibling. Maybe he just wasn't raised "right". Whether a winemaker uses the cheapo wine bottle or the heavy expensive bottle is waste. Doesn't change the wine in the bottle.
I've seen where restaurants take unused food and give/sell to farmer who use it to slop hogs. When my DD was married there were trays of unused food that went uneaten, fried chicken, mashed taters, corn. green beans, salad. When they asked me where I wanted the leftovers to go, I told them to take it to the local city mission. I asked why there was so much leftovers, because I won't have ordered that much. They couldn't explain but knew everyone ate and was eating. The city mission refused the food because of liability issues.
I've been a real estate investor for 22 years, some of my tenants have the craziest living habits. Some tenants upon moveout leave truckloads of good useable items, refrigerators and pantries full of food, good furniture, and loads of pocket change. Wasteful? I dunno, the food bank, thrift shop smile like a butcher's dog when I pull up with a truck load. No use complaining.
My DW and I bought our house band new, 30 years go. The windows screens are still in the boxes down in the furnace room, I have never moved them other than to clean. DW and son are/were severe asthmatics and zillions of allergies. The furnace, AC, and bedroom HEPA filters are on year round.