Since they're doing shared memory in wasm, the choices are "standardize support for shared memory directly, right off the bat", or "let a dozen wasm libraries i

Since they're doing shared memory in wasm, the choices are "standardize support for shared memory directly, right off the bat", or "let a dozen wasm libraries implement shared memory for JS in incompatible ways, then reluctantly standardize it after the fact". I think the former option is preferable.