At the end of the day, if an attacker needs to chain exploits that's still a safer place to be that if they didn't need to do so. Additionally, how relevant is a link in an exploit chain when it's very likely the same overall effect could be had without using that link? Not very.

And as you say, the examples given are really poor; they're barely exploits, that's more like a really unwise feature - it's hard to imagine situations like this arising in practice by accident without being more easily exploitable without even using WASM in the first place - I mean, if you're processing data in a some way and your interface with that processing code includes stuff like eval, that's just a disaster waiting to happen - as web exploits over the decades have demonstrated again, and again.