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It isn't about being great: it is about consistency and cirmcunstances.
UBW happens because of the very specific first scene (Command Spell 1), whereas HF only occurs because of Sakura.
Not going in the spoilers areas, but for F/SN, you -cannot- blend the routes because the triggers for each route do -not- work with the rest, otherwise you are going to a very critical issue in term of consistency.
It has nothing to do with the romance at all. Even if you were to remove the romance (for the benefit of "what if", since HF wouldn't work without the romance), you would still have to seperate the routes.
VN that involves -specific- routes that cannot occur together has a proper reason for being told several times in a different way. Otherwise, the other VN are all eligible for the unified storytelling.
To me, omnibus is basically an exception because the said VN require that method in order to work properly since the merging the routes is impossible (another example of such VN: you just cannot merge Higurashi and Umineko arcs at all).
However, if we take Clannad for instance, even though the routes are very different from each other, it is possible to tie them together and unified them, provided you make some changes for some characters (Kyou and Tomoyo). The routes do not have any contradicting facts conflicting each other, aside the aforementioned 2.
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