I think an important question is if the durability suffers. Reuse is better than recyclability. If they had bricks made of recyclable plastic but they only last

I think an important question is if the durability suffers. Reuse is better than recyclability. If they had bricks made of recyclable plastic but they only lasted ten years, I would argue that was worse. We should push as much as possible for durable, repairable products, and then focus on getting those products removed from the waste stream. Imagine if LEGO was able to incorporate bricks returned to them from Replay like programs into brand new sets. A lot of new sets have unique pieces but they still use a lot of traditional parts, not to mention basic sets like LEGO Creator.