And I would say that this argument still holds true. For extending a game or application, I'd feel pretty bad forcing people to use JS, for example (unless it's EE, where the gloves are off). Wren might be an option, but it's certainly a lot less proven.
Also, there's LuaJIT, if you really need some performance in a small package.
StackOverflow might not be the best source for end-user scripting. (Never mind that I have my doubts about any statistic where Rust ends up winning the popularity contest.)