I think for a communication framework cross-platform has a different meaning then for a simple program or library. I would interpret cross-platform here as "int

I think for a communication framework cross-platform has a different meaning then for a simple program or library. I would interpret cross-platform here as "interoperable between platforms", or I can connect one Actor on platform A to another Actor on platform B. IMHO that's something really desireable, because it doesn't one to using a single programming language on a bigger distributed system.