In my younger days I thought direct democracy was unworkable, but now I realise that might have just been my brain conforming to the bourgeois representative government status quo.
Obviously we easily have the tech to do DD these days, everyone has a smart phone in their pocket, we could do it instantly and on the go. But how you could manage a planned economy that way I’m not sure.
One area direct democracy could work well is where you want the law tied to popular notions of morality -- think referendums like "should X be a crime?" You'd probably want something like 60%+ of people to agree before criminalizing anything, though.
In terms of more technocratic questions (e.g., does this industry-specific regulation make sense?) you'd want some expert input.