Fishing Nuggets/ Copper Nuggets

While mining, I was wondering why we can't get blocks from calm and peaceful fishing compared to mining with mobs. So I think copper nuggets should be added to Minecraft, and we should be able to fish iron and gold nuggets. This would create the possibility of getting actual blocks from fishing rather than just fish, junk, and small treasures. The reason this would be a good addition to Minecraft is because you can build a house now, get actual tools with the iron and gold nuggets, and get armor just by fishing for 10 days. It won't be impossible to get blocks from these, but it will be very difficult. Per block, it would take 81 nuggets (1*9*9) so it wouldn't be easy but it would be possible.