Unless there is an option to cut a slice into a smaller slice, eating less than one serving size by discarding a portion of the food is still portion control.
Do you stop eating when you are full, or do you polish off everything on your plate every time? Do you throw out food that has spoiled and feel bad because you didn't eat it soon enough?
Based on your logic someone shouldn't ever eat pizza if they don't enjoy the entirety of every slice. Do you judge people who pick off toppings they don't like from a compromise pizza? What if they don't eat every side that comes with a meal in a restaurant?
What if they don't drink their entire glass of water? WHY ARE THEY WASTING WATER?
Pro: No additional negative effect on your enjoyment of the food or your body
Pro: compost and let the plants eat it
Con: You cease to be a grown ass man
Eat the crust
Con: Negative enjoyment
Con: Extra Calorie consumed. More strain on the medical system.
If anything, eating the crust would be the "wasteful" decision. I'm sure if it were possible to get the same pizza without crust, all of these people would jump on that chance.
Yeah. There's nothing wrong with the crust, but if you're going to blow your carb budget on a pizza at least keep the pleasure:carb ratio as high as possible.
I used to think like the OP/image, but now I'm in your camp. You should absolutely eat things you don't enjoy if they are good for you. But bad pizza crust is just punishing your mouth while gaining weight.
I understand the food waste argument, but it's wasted whether you eat it or not. You're wasting just as much if you don't eat the peel of the banana.