System decay and city abandonment are two different things.
But yes, if the Lands feature is going to stay, it would at least be nice if solar systems were automatically added to Land when building a city.
See: (Suggestion thread) Automatically Add To Land
But yes, if the Lands feature is going to stay, it would at least be nice if solar systems were automatically added to Land when building a city.
See: (Suggestion thread) Automatically Add To Land