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Most kitchen scales could be easily calibrated with a measuring cup and water if they really wanted to do this. Just have a few included cups for 25,50,100ml of water and then fill them on the scale and tell it what the volume is.
That will easily get you within a gram of error for most common food weights.
The issue isn’t material choice. It’s that plastic can’t be replaced by most materials because of the current function of our containers.
Let me pitch it like this: go to the grocery store. It’s all plastic. The meat? Plastic container. Milk is in plastic. Water in plastic. They’ll even put your potatoes in a pre-packaged plastic sack.
So the issue is that plastic has made its entire niche and therefore is irreplaceable in that niche. Whereas if we would swap over to reusable milk containers and dispensers or refillable chip bags, we’d be miles ahead even if those were all made of plastic still.
The problem isn’t containers, it’s the existence of disposable packing being the only option.