Do you understand that Paradox is a business, and that much as we might like to imagine our importance as consumers, their first obligation is to their investors?
Releasing a game early, filled with more bugs than was absolutely unavoidable to meet the release date, won't sell a single extra copy of Stellaris that they weren't going to sell post release anyway. Releasing it early, with extra bugs and problems, will damage their sales with every angry steam review it gets as a result.
Why do you want to hurt Paradox? Why do you want to damage Paradox's reputation? Are you from EA?