You called out the classic "Anyone can write a blog in a day" (or in a hackathon) paradox.

It's easy to ignore all the hard parts and feel highly productive accomplishing a proof-of-concept in a short period of time. It usually turns out the POC is fairly trivial if it gets to ignore all the time consuming parts of the problem such as error handling, parameter validation, security, CICD pipelines, automated testing, documentation, and fitting into a larger ecosystem.