Nobody is saying AI should make entire games for you. Other engines are integrating AI because it can genuinely help with game development - assist with complex code, automate repetitive tasks, answer engine-specific questions.
This is especially important for new users. In GDevelop, I can tell their AI what kind of game I want to make, and it will pre-build a project, explain the next steps, and answer my silly questions.
If I'm a C3 newbie, my options are to Google everything myself or post on the forum and wait 2 days for someone to reply.