And now we learn they use Swift and Kotlin to replace React with. So they are not replacing it with Ruby. I think they've hit the limits on Ruby (like twitter had on Scala).
P.s.: I find Kotlin "an acceptable typed-Ruby" with an industrial strength VM (the JVM) and two compiles to native stories (KMP and GraalVM-native).
And now we learn they use Swift and Kotlin to replace React with. So they are not replacing it with Ruby. I think they've hit the limits on Ruby (like twitter had on Scala).
P.s.: I find Kotlin "an acceptable typed-Ruby" with an industrial strength VM (the JVM) and two compiles to native stories (KMP and GraalVM-native).