I agree a simple production app can be great on Heroku. However besides being costly it is also hard when you want a managed service that isn’t on the platform. There are other reasons, https://gitlab.com/gitlab-org/5-minute-production-app/deploy... lists 9 in total.

While a production app on Heroku isn’t hard it isn’t trivial either. We’re trying to make the 5 minute production app faster to set up than Heroku for production apps by automatically configuring a bunch of services. We’re not there yet but that is the goal.