I totally agree with you. Please see the use of "Day 1 to Day 3" as the necessary historical time line limits and not as the limits of a predefined course of the battle. UGG is very open to "what if" scenarios for both sides, even from Day 1. It is depending on the player's performance reproduce or rewrite the battle of Gettysburg.
Given victory points will never be the required objective nor will define directly the outcome for any battle in UGG. You'll never see a "capture hill A for 50 victory points!" objective. They are just numerical interpretation of the capturing points which appear only in the outcome report for every battle. Added to other numerical factors (e.g. casualties) will produce the final score for the current phase of the battle. However, as noted, this score is a secondary evaluation for the battle outcome. The main important factor will be always the capture points.
The need of using strategic plans and tactics will be more than necessary in the battle as well. Especially the upper levels of AI characters will keep "remind" that to the player on the battlefield. Here is a small part of one of my battles (Day 1, Phase 2, player US against Defensive AI character):
"(...) From the moves of the AI, I can see that he aims to Oak Ridge. I have already fortified it with artillery batteries and enough infantry. Fresh reinforcements allowed me to extent the front line Seminary - Oak Ridge to the south of Barlow's Knoll, creating a Γ line, protecting the same time Oak Ridge from the east and the city from the north.
(...)
That was just in time: new enemy reinforcement approach from north east towards Barlow's Knoll. Now Defensive will be able to attack Oak Ridge from west, north and east. Should I stick to the plan protecting Oak Ridge at all cost? Or I should re-deploy my forces on a new line Seminary - North Gettysburg? I cannot afford loosing Oak Ridge and let the the enemy deploy his batteries over there. I can stand an attack from west and north. If he will move his north east forces to attack there as well from the east, I'll bring my forces south of Barlow's closer to Oak Ridge reforming my front line from Γ to Λ. The same time my reserves in west Seminary, could help by attacking from the south to his attacking forces west of Oak Ridge. It looks like a good plan.
(...)
But it was not good enough against this Defensive. AI made a couple of sporadic attacks from the north which proved it was just for diversion. Almost the same time he launched a simultaneous attack against my both flanks. My right line which it was supposed to move closer at the east of Oak Ridge, was breached and cut off. My left flank was pushed hard from his right flank, unable to help the imminent main attack towards Oak Ridge (...)"