I'm not sure I quite understand your proposal. You talk about a congress network making decisions, but

1) how are those decisions audited? Tezos decisions can be audited and verified unambiguously on its blockchain.

2) how are those decisions enforced? Tezos upgrades are automatic, if a protocol upgrade is approved, it is enforced on chain. This isn't just people making a decision and then clients choosing to follow it, this has the full force of a smart contract.

3) how you enforce meta-rule? This is constitutionalism. Can you programmatically constraint the type of protocols that your congress network is allowed to pass? If not you don't have consitutionalism.

Tezos does all of those things, and it is a hard engineering challenge to do it, but ultimately worth it. If we only wanted to have a simple vote, we'd have released two years ago.