Well his point is this. IN the Q&A someone asked if Area 51 would be in F: NV but the bethesda answer was that it is a bit too far outside the mojave wastleand to include.
I'm betthing the OP is saying "use the car so it makes it possible to get there".
I still don't see why we need a vehicle, be better with a sign at the border of the main map.
Or hell, even just have a transparent red on the ground by the border.
That would be an even better homage to the old games than the Highwayman.
Besides, adding the car would make a crapload of people whine about that they can't actually
drive it.
[edit]
Why I feel this way is because I don't understand why it's so impossible for The Lone Wanderer (And maybe even The Courier) to actually
walk somewhere while Vault Dweller and Chosen One had to walk for months.
On the other hand I do agree it's a very functional mechanic and that if we do need a vehicle (<_<) then this would be for the best.
Cause it's better (Convenient) with one vehicle to use to get outside of the map than several on different locations.