The same issue I have with Render, I also have with this. If you have to create a config file for the environment, you aren't giving me a Heroku-like experience.
Give me an opinionated default that works well for most situations that I can then build on top of, configure further, etc..
They're definitely required for at least some scenarios, as a raw deploy didn't work for me, they're called out in the help docs, and I had a chat w/ their CEO on the topic a few weeks ago.
Give me an opinionated default that works well for most situations that I can then build on top of, configure further, etc..