This is something, which shows, that either there is some genius self-hosted one-click solution, which fixes all that automatically or there will always be custodial wallets, which will be used by a lot of users.
Discussion
I knew what I was getting into with a full self-costodial setup. But those nothingburger error messages are no excuse, they plain suck - sorry.
I don't mind crawling logs and stuff but if even the two direct CLI commands do not output anything that the logs eventually tell me, there is a discrepancy between what is promoted (how easy and fast Lightning is) versus it's usability (that the actual error message is buried within logs). Granted, CLN doesn't produce a lot of output at all - so finding this was easy.
That still doesn't make it good.