That seems to be the excuse every original Fallout purist gives me when they've run out of logical answers regarding why the world is bad, and I'm very sad to see you actually say it. Because it doesn't make a lick of sense.
Well except it is that logical reason that is, indeed, make sense of it all as to why the world is what is was. Putting a whole bunch of illogical, worthless location isn't what Obsidian has in mind. Heck, its even arguable what is "love" in location in a sense in comparison of the two games. So far, many locations I visited in New Vegas were better put in through as to what there and how and why. Many of them are even serve as quest location.
If Obsidian was not trying to at least mimic Bethesda games, this game would not be open world, plain and simple. But it was, so it's obvious they were trying to mimic Bethesda's open world and failed at it. If they were TRULY trying to make a Fallout game, they would have used the map system from Fallout 1. But they didn't, because that's not what Bethesda fans were used to. So they attempted to copy what Bethesda fans like (aka tried to make a Bethesda game), but failed at it. You could throw all sorts of further excuses at me such as "They didn't have enough time" or "The engine wouldn't allow it" but at the end of the day, all we can judge is what Obsidian actually did, which was poorly mimic a major part of a Bethesda game.
Its all about engine and how Bethesda put them in charge of the game with the engine. Speaking of which, it is much easier to just use the existing one with Fallout 3 rather than try to blow out more time in finding a different, workable engine and make it to the deadline.
And lets be honest with two things. For one thing, the map system isn't expected. If that were the case, I would like it with an overhead, isometric view and all the goodies that were in the previous Fallouts. But that isn't the case, and more ways than one, there were able to bring that feeling of previous Fallout games WITH the engine they were provided. They manage a balance.
Another thing, I pretty much expected this backdraft seeing that a handful of people would not like Obsidian's approach because it wasn't made with Bethesda's style in mind.