(Apologies, I’ll just copy-paste what I wrote in ElixirForum)
The only thing I am seeing in this idea is that somebody doesn’t seem to get the message that Javascript is not the future 
“Stop trying to make JS happen. It’s not going to happen.” , as one meme goes.
The JS runtime is awful. As much as you try to fine-tune it it will inevitably spill its guts at the first sign of trouble. People spent weeks hand-crafting a Phoenix-like case for 1-2 million connections on a single server and it was a back-breaking work.
But that community doesn’t seem to be learning.