Of course, the trusted third party can also be decentralized and spread among multiple trusted parties (some of which could even turn out to be adversarial, as

Of course, the trusted third party can also be decentralized and spread among multiple trusted parties (some of which could even turn out to be adversarial, as long as you use some Byzantine consensus algorithms). I think that weakens the case for full trustlessness further, since most real world applications require some level of trust anyway - but it would still not make you dependent on a single trusted entity.