Oh, I see your point. Yes, the fact that WL is pretty good documented (quo, Deathway, ...) doesn't say it's less secure. Security by obscurity usually doesn't work in cryptography, why would it be any better in RCE.
Edit: Other way round, sometimes security by obscurity is all you can rely on in RCE. Disproving my own arguments, that's the way to go!
I just compared VMs from what I know about them and RISC seems to be way more confusing than VMP.