Maybe so, but in the long-term, I can't help but imagine that a single WASM runtime for cloud functions has to be more predictable and easier to optimize compar

Maybe so, but in the long-term, I can't help but imagine that a single WASM runtime for cloud functions has to be more predictable and easier to optimize compared to doing the same for the runtimes of all individual languages used. I think the promise of WASM is a huge reduction in duplicated effort industry-wide. With WASI too, the possibilities for interoperability between languages looks promising. I would check out the Wasmer runtime if you're curious about it.