> Systemd has tools for that, such as systemctl cat which shows all applicable configuration and what files they come from.

Sure, it could be that systemd does have amazing tooling for helping users with the burdens they have created. Or, given the very mixed feelings about systemd, maybe they've tried to be user focused but not hit the mark. I don't know enough to say.

But my point is that either way responses of the form "it's so easy, you just have to remember [9 paragraphs of detail users don't care about]" are part of the problem, not the solution.