I think partial decentralization would introduce the worst of both worlds: you might place your trust in a small number of potentially malicious actors (external centralization), yet they’d only be subject to on-chain rules and regulations (internal decentralization).

Of course I’m aware that there are attemps to incentivize oracle providers to play fairly (and even “decentralize” oracles), but I don’t quite see how it can be definitively resolved. Not saying it’s impossible, but I just don’t see it (or understand it) yet.