Mostly that's the case, yes. The main benefit of wasm sandboxing in this situation is to keep any exploit of these libraries in the sandbox - no memory corrupti

Mostly that's the case, yes. The main benefit of wasm sandboxing in this situation is to keep any exploit of these libraries in the sandbox - no memory corruption outside. That's a big improvement on running the same code outside of a sandbox. (But in general corruption inside the sandbox is potentially dangerous too. You need to be careful about what you do with data you get from the sandboxed code. RLBox does help in that area as well.)