...Once you finish a game, you have no control how people will play it...
Very true. Which nobody should consider a bad thing. Tastes vary. Vive la difference. Et vive la liberté.
An author should build a mod exactly the way they would like to play it, themselves, following the axiom to please themselves first. If an author can please himself (or herself), that is the deepest and purest satisfaction to be found for them in their efforts.
Since nobody else who ever plays the mod is exactly like the author, their experience will always differ, to large or small degrees, from the author's, even if they technically play it, move for move, exactly like the author. Their perceptions and esteemings of every point and detail will reflect their own individual personality --their own way of looking at things, evoking entirely individualized reactions. They can never play it as the author
. They can only play it as themselves.