It's a fair criticism IMO just done in a rude way (again, IMO.) - - - - To me "just" in that sentence would be (IMO) a signal that the speaker hadn't thought

It's a fair criticism IMO just done in a rude way (again, IMO.) - - - - To me "just" in that sentence would be (IMO) a signal that the speaker hadn't thought things through deeply enough. The jargon word "circular" is the clue. It's not just about the 3D printing of wood, or biodegradable glue, it's about a sea change in our economy and technology to be in harmony with (for lack of a better word) Nature (and therefore durable on large (10K to 1M years) timescales.)