> It is incredibly memory inefficient and will cause the user's machine to crash. Not everyone is running the latest ThinkPad or Macbook with 64GB RAM.

Thankfully, you don't need that:

> Lastly, we have an upper-bound on the size of the closure we can fetch. The whole closure has to fit in tab memory, which is set to a hard limit of ~1.5GiB as of now and WebAssembly has a hard limit of 4GiB as it is a 32-bit address space.

And it works fine on my 3-year-old phone with 8G of RAM, so I think your complete dismissal of VMs is excessive.