I mean I crafted complete complex game prototype using Gemini 2.5 Pro with nearly zero coding. I done it in a week: with client-server architecture, robust networking, AI, acceptance test coverage, replays.

It just different way to build software. You just spend 30% of time on specification, 30% on testing and 30% on refactoring also using AI.

Actual slop generarion take like 10% of time and rest of the time you turn it into maintainable code.

Of course you can do it manually, but then it will take 5-10 times the time and you wont be as flexible in changing things because with AI you can do major refactoring in a day, but manually it could take weeks and kill the project.