I'm making a game in Rust and Godot (engine) and since it's a factory game the simulation performance is important. Rust means I worry far less about stability and performance.
I bet if you wrote a good blog entry with screenshots and explanation of how your code loads and renders I imagine it would do well on HN.
Rust is good for this sort of thing. It's overkill for most web back end stuff. That's where Go is more useful. Go has all those well-used libraries for web back end tasks. Parallelism in web back ends tends to be about waiting for network events, not juggling heavy compute loads of coordinated disparate tasks. Hence all the interest in "async" for web servers. As I've said before, use the right tool for the job.
You have an authoritive world simulation server, as usual.
You then have several servers whose chief job is to keep clients in sync with the authoritive server.
Most network games combine these two roles, but there is a lot of processing and network traffic required to keep clients in sync. For massive multiplayer there is a benefit to scale the "client-interaction" servers.
There's a reason why Epic is able to charge a percentage of sales for their engine, and companies still opt for it. That's because it's hard to do reliably and with good performance and visuals.
The claim was that Rust made making something parallel easy/easier, and the illustrative example given was someone trying to parallelize something in a game engine. Whether Rust is good for game development or not is irrelevant to the point that was being made.
Even if everyone accepted that Rust was horrible for game development on most metrics, the example given would still carry the exact same weight, because it's really about "parallelizing this would be very hard in C++, but it was very easy because of Rust."
I'm using Rend3, which is a 3D graphics library for Rust that uses Vulkan underneath. Rend3 takes care of memory allocation in the GPU, which Vulkan leaves to the caller, and it handles all the GPU communication. The Rend3 user has to create all the vertex buffers, normal buffers, texture maps, etc., and send them to Rend3 to be sent to the GPU. It's a light, safe abstraction over Vulkan.
This is where Rust's move semantics ownership transfer helps. The thread that's creating object to be displayed makes up the big vertex buffers, etc., and then asks Rend3 to turn them into a "mesh object", "texture object", or "material object". That involves some locking in Rend3, mostly around GPU memory allocation. Then, the loader puts them together into an "object", and tells Rend3 to add it to the display list. This puts it on a work queue. At the beginning of the next frame, the render loop reads the work queue, adds and deletes items from the display list, and resumes drawing the scene.
Locking is brief, just the microseconds needed for adding things to lists. The big objects are handed off across threads, not recopied. Adding objects does not slow down the frame rate. That's the trouble with the existing system. Redraw and new object processing were done in the same thread, and incoming updates stole time from the redraw cycle.
If this was in C++, I'd be spending half my time in the debugger. In Rust, I haven't needed a debugger. My own code is 100% safe Rust.