You wrote before:
Perhaps you could have phrased it differently but I’m still looking for an example of what from Tweaks’ appearance tweaks you think such users want or need? Half there doesn’t work and the other half probably is time better spent on the recoloring API. Why refer the user to Tweaks for that from the Appearance panel?
The examples you gave of what you use—“tweaks to focus, startup apps and seconds on the top bar”—are not about appearance but about window behavior, XDG autostart, and date & time. If such options are deemed general enough for the average user, and there’s a good design proposal, they might be suitable to be added to Settings like the example I gave of the Multitasking panel.
Tweaks app exposes some selective additional options for tinkerers but if you use gsettings, or dconf Editor, you can find more options (some of these may be deprecated or for future changes). Should the user also be referred to those apps? I think the answer on all is no.
The Settings panels should present a well designed, integrated way to configure the system to the user. Referring the user to other apps that can be use to tinker with system configuration I think does not belong on the Settings panels. That belongs on a wiki.