No one has ever articulated the details of what they mean by these runtimes having different GC requirements. JavaScript garbage collection has no "semantics"--it is entirely invisible to applications. Even WeakMap and WeakSet do not expose garbage collection details because they are not iterable.

The memory profile of JavaScript applications tends to look a lot like the memory profile of typical Java applications. It tends to be a law of large numbers.

Now if you want to talk about details of how we implement runtimes that do have observable GC details, like weak callbacks, Java's zoo of reference types, etc, then let's do that, because Wasm GC will eventually need to have low-level mechanisms to support those.

But if we're talking about a Wasm engine GC's ability to allocate, trace, move (or not!) little blocks of memory around, then I don't see any fundamental stumbling blocks to making that mechanism efficient and universal.

I would assume that there’s Microsoft folks involved to make sure it works out satisfactory given their investment in Blazor, but yes, it’s always a possibility that an API is bad. I don’t know what their level of interest is in embedding wasm inside C# is.