On the other hand where do you put the limit on what is a acceptable burden ?
Here are the rules for recycling where I lived: plastic to be cleaned before recycling (a minimal trace of food, allegedly, would require the whole batch of plastic to be thrown away). You are also supposed to separate the plastic part from the cardboard part on the packaging. You are also supposed to check if there is a specific type of coating on the inside of a cardboard box like foil for milk or wax for cups. Metal, Glass need to be cleaned too, although without threat of discarding a ton of waste. Paper is recycled separately from cardboard, however I believe that was for operational rather than technical reasons. Recycled paper could not be recycled again and glassy paper (magazine covers) needed removal.
When you get to that stage you realise that the average product in the supermarket would require quite a lot of processing. That's not realistic to expect people to follow all those rules and if you rely on thousands or ten of thousands of people to comply with them in order for your recycling to work, you are deep in the designed to fail territory.