Looking more closely, it looks like there are some "North" sides (platforms) with ABI shims (currently Linux and OP-TEE), but others (Windows, for example), would still require recompilation.

> If you have to recompile, you might as well choose to recompile to WASM+WASI.

I disagree here; this ignores the entire swath of functionality that an OS or runtime provides? Like, as just as an example, I can't "just recompile" my OP-TEE TA into WASM when it uses the KDF function from the OP-TEE runtime?

I had previous experience with WASM on TEE. Just use the foreign function interface. Remember WASM isn’t native code so you still need other native code to run WASM (such as wasmtime), and you can import other native functions into WASM through the runtime.