While I agree that our context changes, I don't see why it would have an impact on God's very nature.
We can't see God, so only Himself can tell us about His nature. And who does God talk to? Who does God reveal things to ? To select people He sent to the rest, prophets and messengers.
That's why some people coming together to vote in multiple occasions (ie. the different councils) how they want God to be is far from divine revelation especially when it contradicts Jesus.
What do you mean we can no longer have a Bring-your-rooster day?