@Cernel AoT could function without capitals. But they also ensure that the map centers on the player's capital at start of the player's turn. In AoT the map centers on capital and a special start player turn is played.
Also, a distinctive capture-capital sound is played when conquering 1 of the 7 needed capture points/capitals. If the victory locations were not tagged as capitals, then players would not be noted about the loss of an important territory, at least not with a special sound. Is there any specific reason or way the gameplay would be improved by removing the capital tags?
Yes I have also noted that the production count that triggers a victory does not correspond with the total production count in the tabs. I see this as a minor issue, and I actually haven't regarded it as a map issue, just an annoying engine thing that probably has its reasons for being as it is.
The 350 PU victory could probably be set to 300 or lower, but it is mostly meant to be a vs. AI win value. My impression is that humans would surrender a long time before this, just as they would surrender pretty early in most other maps with PU victory conditions set. I guess people can see already from the first couple of battles see where a game is heading. But I also think (at least from own experience) that when playing against the AI, it is fun to finish the job and annihilate the AI completely, playing way past the point of a sure win. I kind of assumed that others felt the same way.