One of my mates generated an entire website using Gemini. It was a React web app that tracks inventory for trading card dealers. It actually did come out functional and well-polished. That being said, the AI really struggled with several aspects of the project that humans would not:

• It left database secrets in the code
• The design of the website meant that it was impossible to operate securely
• The quality of the code itself was hot garbage—unreadable and undocumented nonsense that somehow still worked
• It did not break the code into multiple files. It piled everything into a single file