What if X is more reusable than Y but Y is the thing that is on the books. Now you have to lobby the government. Fun. Also, it's very hard for a bureaucrat or anyone else to make a judgement on what is going to be the most efficient what to organise the blue economy. Every day people invent new things, my understanding is that recycling and re-ellasticing bio-polymer is there way to go, but time will tell.