For any given decision you make, you either only affect yourself or you can affect others. Similarly there are people making decisions that could affect you. In the situation where a decision could affect you, wouldn't you want to participate in that decision? That's what democracy allows you to do.

committees increase your autonomy because you can participate in decision making that could affect you.

obviously if it ONLY affects you and nobody else, then a committee should not be involved.

The alternative is someone unilaterally making decisions for many people, and where I'm from, that's called authoritarianism.