> And, I've seen it in Rust as a "workaround" for the borrow checker, where that framing tends to make it feel like cheating or settling, which IMO is unfortunate since when people arrive at it for other reasons it seems to have a lot of other benefits!

Great point! I've been using Rust for 4–5 years now and putting objects in Vecs and using integers as "pointers" felt a lot like cheating (i.e., "I'm doing the wrong™ thing!"), but every time I tried to "fix" things to use references my code ended up uglier, harder to understand, and sometimes slower.

In time, I've learned that it's perfectly fine way to structure data. And as you point out, it makes it easier to work on a large structure structure itself rather than having to go through its individual components (e.g., you can manipulate all the nodes in a graph with a simple for loop rather than having to do a DFS/BFS traversal).