I played with the Crash Canyon build of Roblox (the one with the articulated physics) a few weeks ago.
I found a rope class which seems to work pretty well (although it uses linear ropes, no curves or anything)
Creating ropes on roblox without scripting is perfectly possible using the Glue Joints and Oysi proved it.
If the individual parts annoy you, you can just write a script which draws lines between the parts which have no physical interaction.
To prevent glue from breaking, its usually helpful to have 3 per connection, and check for objects getting removed so you can recreate it without a problem.
How hard is it to make your own rope system? Verlet Integration.
Not saying that rhetorically; I have no idea how hard it is to do since I’ve never tried it. But I’m pretty sure Verlet Integration is the method used to simulate it. From what I’ve read about it in the past few minutes, it seems somewhat straight-forward.
Most of the articulated physics / rope / other interesting physics demos were just that: Tech demos. It’s not like they were really close to being released for use in a real multiplayer environment and thrown away at the last minute.
As you’ve seen with all the CSG & CSG Physics stuff: Getting something from “working” and/or “tech demo” to actually being being a production ready feature is a long process that takes a lot of people.