Because AI is not there yet. Boilerplates are the better option until AI generation catches up. Here is what I do:

1. Explore an idea, research what competitors do, etc.

2. Use my own boilerplate for a greenfield project https://achromatic.dev (sorry for self-promo)

3. Write down what I actually want and paste the text and screenshot to v0 to see if it can generate something useful.

4. Improve/write the initial code by hand.

5. Paste the code into Claude and improve it more manually in an iterative fashion.

6. Make sure it is consistent with the rest of the codebase.

PS: I'm deep into developer tools now. Have forked the original drawIO/mxGraph, resolved all monkey patches, translated everything to TypeScript, added Multiplayer and more (~250k slocs) - ready as a base to explore some tools like one that solves your described problem. Here is a screenshot: https://i.imgur.com/opiu7z4.png I do envision Achromatic as a dev/design tool company.