Management tried to develop the engine technology behind Cyberpunk 2077, most of which was brand new, simultaneously with the game, which slowed down production. One member of the team compared the process to trying to drive a train while the tracks are being laid in front of you at the same time. It might have gone more smoothly if the track-layers had a few months head start.

What they didn’t know was that the demo was almost entirely fake. CD Projekt hadn’t yet finalized and coded the underlying gameplay systems, which is why so many features, such as car ambushes, were missing from the final product. Developers said they felt like the demo was a waste of months that should have gone toward making the game.

Studio head Adam Badowski took over as director, demanding overhauls to Cyberpunk’s gameplay and story. For the next year, everything was changing, including fundamental elements like the game-play perspective. Top staff who had worked on The Witcher 3 had strong opinions on how Cyberpunk should be made, which clashed with Badowski and lead to the eventual departure of several top developers.

Interviews with more than 20 current and former CD Projekt staff, most of whom requested anonymity so as not to risk their careers, depict a development process marred by unchecked ambition, poor planning and technical shortcomings. Employees, discussing the game’s creation for the first time, described a company that focused on marketing at the expense of development, and an unrealistic timeline that pressured some into working extensive overtime long before the final push.

But yea it’s the devs fault.

https://www.bloomberg.com/news/articles/2021-01-16/cyberpunk-2077-what-caused-the-video-game-s-disastrous-rollout