Because ya essential can do anything ya want in a freeform way, all before the battle.
Way I see it, having no gameplay after the the battle already take care the say "complain" I mention already. And the way the game is handle, one should already be curious how or what happen if they play on the other side of the fence rather then being an expect of all trades and skills. They are more focus on ya involvement pre-battle wise. It would be too much resource for something that is really the end. They have to show this and show that and show it to everyone and everything that happen within the ending.
And again, Fallout 2's way of ending thing is merely, in all case, nothingness. Practically an Easter egg on both encounter. There really nothing out there left if one did all the quest to get the very ending that happens a couple minutes ago.
