I'm not sure decentralized power is really what you want. Sounds like "mob rule" to me. You really believe that "mob rules" is going to turn out well in the end?

Constitutional democracy is likely the best system there is.

And the results you get from constitutional democracy will vary and depend on the institutions and rules and laws and norms your society imposes on the actual practice of Constitutional Democracy.

Switzerland is probably closest to practical perfection - on how to run a Constitutional Democracy.

The US is way way way down the ladder in terms of how efficiently and effectively the system works in practice.