I somewhat share the sentiment, but realistically speaking this is one of these areas where "what's done it's done" and is completely out of the question to ask for changes/redesign now.
That said, I may be wrong but I expect act 2 to consist of more than one map.
Probably a central hub (the city of BG and surrounding areas) plus a bunch of extra zones loaded separately for various questlines.
Technically, act 1 will most likely have more than one map too
