Can we avoid data segment fill at every instantiation?

Reading https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md#initializing-memory-only-once, with

The data segments are always copied into linear memory, even if the same module 
is instantiated again in another agent. One way to ensure that linear memory is only 
initialized once is to place all data segments in a separate module that is only 
instantiated once, then share the linear memory with other modules.

if I understand this correctly, this will prevent Emscripten and other compilers from being able to place data and code sections in the same .wasm file, but must always use two separate files for them, similar to how .mem files are being used in asm.js.

It sounds like it would be easy to add a Module.instantiate(..., noDataSegment: true); type of machinery to avoid this? Given that there's an explicit paragraph about this in the document, I presume this approach has been considered already before, and was turned down? I'm curious, what was the conversation about it back then?

Start with the linked Threads proposal section on initializing memory only once, then read the 43-comment discussion on this issue. No source files or tests are named, and completion would require a settled design or documented decision about avoiding repeated data-segment initialization.