"This is exactly the wrong way around: The GUI requires the daemon, not the other way."
I find it very helpful when I install a package to have apt suggest packages that might be useful along with a package I am installing. It is a huge advantage to not have to always research things, but to simply be able to say, sure, "I'll try that too"; or "no thanks", I don't need support for "ldap, X...". It is not a dependency, just a suggestion.
And not all GUIs require their daemon anyway, the daemon might be running on some other host(s).