I do see your point but I don't see the relevance of the passage of time.

We live in an age when we actually have access to reliable translations of the early sangha's suttas, recorded from the Tathagata himself. And we actually live in an age where people achieve full enlightenment practicing those teachings in the way that the Buddha taught them.

For me, I have faith in the Buddha's awakening. I know there are teachers in history who revised the dhamma, contradicted the Buddha, put their own twist on things, but none of them were a Tathagata. I have found no teacher who was so inspiring that I can believe them when they contradict the Buddha.

And if a teacher says, every person is fully enlightened, or nirvana and samsara are the same thing, I do think this is an obvious contradiction of the Buddha's teachings. I think this reduces the Noble Path to the end of suffering into an empty intellectual/philosophical exercise, which is exactly what Buddhism has come to be for many people.

If every person were fully enlightened, they wouldn't suffer. Philosophical arguments that pretend suffering doesn't exist or isn't real destroy the engine inside the four noble truths.