Yes, Lego's product is very durable (not sure about sustainability), I think mostly because it is very stable: bricks are simple and they don't change. Well, no

Yes, Lego's product is very durable (not sure about sustainability), I think mostly because it is very stable: bricks are simple and they don't change. Well, nowadays they seem to be doing a lot of custom bricks for specific models but by and large bricks can be kept across generations. My previous comment wasn't sarcastic. I think the main issue for Lego is that plastics have a bad rep. They can't say "who cares 5,000 tons is nothing" as that would be PR suicide and they can't stop using plastics, either... hence them trying to move to recycled plastics or at the very least to be seen to be seriously trying to do something.