It's the new capitalist game development paradigm. Slash the QA budget, push out a buggy, incomplete mess of a game as quickly as possible to maximize profits, let the dupes who bought it early do all the QA testing for you, take in all the user feedback telling you why this game is a buggy incomplete mess, then release a bug fixing patch a week or two later to address the major problems players are making noise about. Because god forbid they delay launch and properly bug test so the game can be released in a stable, playable state.

It's why I will never, ever preorder any game ever again, and why I pirate every game to see how it runs before I consider buying it on steam (and I only pay for indie games, anything from AAA studios stays pirated forever).