From me using Claude Code, without a proper system prompt, Claude generates code rather than using a library, this week e.g. command line parameter and flag parsing. The difficulty is where the tipping point is to use a library, it can't be https://www.npmjs.com/package/is-even
Doesn’t seem like you can blame NIH on AI more than other motivations for NIH.
Edit to add: If AI makes NIH easier, then it implies that AI is good at solving problems, and speaks to AI’s credit.