I'm not convinced by sortition because it seems to hand power to those who offer advice to the randomly selected representatives of the people.

The problem is that national level legislation is often large-span, complex, full of detail and technical wording.

In countries with a strongly technocratic civil service, this may not be so bad, just undemocratic. But in countries with a weaker civil service, legislation will be written by "helpful" lobbyists.

Some legislation could of course be simplified, but it should be noted that simplicity is often the ally of a shrunk state conservatism.

Why do I think it will be worse than now? Especially when I'd be the first to admit that it's very bad right now?

Because as bad as they are, parties remain organisations capable of drafting legislation for political objectives. And those political objectives provide a way for alternatives views to be incorporated, beyond technocracy and the lobbyists.

Of course, the worst thing about my view of the world is that progress only comes through either reclaiming parties of the left, or setting up alternatives like Syriza who only gain an opportunity at moments of great crisis.