The point of warfare is to destroy the enemy forced in the field without suffering undue loses yourself.
"Victory hexes" are a simplistic game method of pointing out to (probably civilian) players (and the AI) where might be a good place to go and/or defend, really. Like those paintball gun games where someone takes the flag to "win".
They also help the AI decide when to throw in the towel
There are no such things as "terrain objectives" in modern warfare. Terrain is only of value if it gives you an advantage or denial of it from the enemy confounds any such for him. There may be phase lines and reporting points, but those are to shape the battle plan, not "must throw a million troops at it WW1 style" things.
(It is also a normal point in civilian wargames that these objectives are
common to both sides as well!
Look at the points awarded for v-hexes as a
bonus, or "gravy" to sweep up after or during the real mission of deleting enemy units (while protecting yours) as appropriate. (while remeberig that both you and the opponent will eventually concentrate in those areas) The paintball type "take the flag to win, regardless of cost" is
not appropriate here.
If playing PBEM human against human - you really should consider having no artificial "victory flags" at all. Then you can concentrate on the proper find,fix and strike process on the enemy forces, which is a different task altogether without these "hint markers" plonked on the map!
.
Cheers
Andy