The title was chosen poorly, and the blog post did not reflect on its intentions. For that, I deeply apologize.
The experience and first time with Heroku is my raw impression, also the fact that I am a backend developer who is learning frontend and web apps.
It is a hard lesson learned today, although I am here for it. Iterate and improve, listen to feedback, and learn.
Sytse helps with his expertise and vision on the 5 minute production app, responding here to help. He is not to blame at all, I truly appreciate his guidance and thoughtful responses.