Okay then there are mixed views going on here. Some people want maps to have the same direction, some want to rehaul the map for a different story, some want to simply throw in other objectives. It’s hard to keep track of them when everyone uses the umbrella definition of ‘using the same maps’.
Reversing the direction is by far the worse thing you can do to map. The entire map lay out at geometry have been designed so that they can be defended well. It would be akin to a scenario where one side needs to break out of a besieged fortress, oh well, Lord of the Rings already showed what happens if you try that
The story itself is also meant to develop in one way, the map develops from areas of low importance to areas of high importance. The security could’ve landed anywhere on container city, this point just happened to be the most convenient to them. There’s nothing significant about the peer they start on and you would require some serious fluff-judo to make it a significant point to fight over.
Now as for keeping the direction, it would still be bad idea. Firstly because it’s not really the objectives but the maps themselves that dictate the gameplay. Whether you need to blow up or construct the objective, the game remains largely the same. Just go back to ETQW and imagine different objectives while keeping the map. Hardly anything changes. Compared to reversing the direction you would generate very little extra content and frankly it wouldn’t be worth it.
As for revisting the map for the sake of the story this is great, but then you can think of re-combining sections from different maps, imagine how the areas stood the test of time etc. Something like Blizzard did with their last WoW add-on Cataclysm. They drastically changed already existing conditions. However you have to keep in mind here that they even used a higher budget and more resources in general to re-design these areas and the result is very tasty indeed.
So I hope I cleared up some confusion here. My position on three different ideas.