Just discovered that the rope weaver's hut goes obsolete at Industrialism and you can't get the Rope Factory until Plastics, which is one tech further down. There isn't an intermediate building for rope like there is for baskets, etc. so you lose all access to rope for the time it take to research Plastics (assuming you don't switch to something else first) and then build a Rope factory. And even worse, if you lose rope your fisherman's huts stop working, each of which provide nets and up to 4 health, and when you lose nets you lose all your Fishing buildings and the Raw Fish and Shellfish resources they provide, which means you lose the drying racks and the dried meat/fish they provide.