While in some cases it is a quite thin layer - some commands just proxy along to the underlying Docker command + some flags - I'd love to hear more about places where Dokku itself wasn't useful for debugging your deployed system. Please feel more than free to reach out via Discord/IRC/Slack[1] (all three are synced) with more info if filing an issue is a big reach. I'm more than happy to help folks debug live/file issues as a result, as it makes the project much better.

[1] https://dokku.com/docs/getting-started/where-to-get-help/