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There's also the problem of having to lay a hex map over the entire world, which would severely affect the player's ability to move over terrain in a believable manner given the amount of rubble and ruins strewn around in FO3 and FONV. How would jumping in combat even work? You'd have to add in a whole nother layer of abstraction thanks to movement concerns that games like FF and Dragon Age simply don't have.
TB works in Fallout 1&2 because they're entirely 2D and so lack a more dynamic sense of player interaction with the environment; reconciling the rich terrain of the 3D games with a very 2D combat system would be difficult.
See, I think this is a common misconception about turn-based gaming. And one that is not at all true in the least. However, most gamers aren't generally going to have thought about turn-based gaming enough to have considered what it could be capable of, versus what the system was confined to 10, 20 years ago or so. (It's kind of like if I were to base my impressions of the limitations of first person shooters based on what Quake 1 was capable of.)
The truth is that most of the table-top strategy games I play don't utilize a grid at all. If you really dig into the genre, start painting miniatures, etc - chances are you're not playing a grid map at all, but instead using measuring tape. The old Steve Jackson game Car Wars, even - though it is generally played on a map with a grid overlay - isn't confined to moving within that grid, at all. So no, there's no reason that a turn-based Fallout game would inherently have to make use of a grid at all. Perhaps back in the day, there was a bit of a technological limitation with having to make the necessary sort of calculations and animations necessary to go "off the grid," so to speak. But with where videogames are today? Absolutely not. There's just no reason if would have to be confined in such a way.
Ditto with the false impression that turn-based games would have to be 2D. I've played plenty of 3-dimensional turn-based strategy table-top games. And if you can accomplish that with plastic models and wooden dowels, etc - it could only
easier to accomplish via a computer.
I think there tends to be a false concensus that when a Fallout fan talks about turn-based, that automatically what they want is a bird's-eye 2D game that makes use of sprites instead of modern 3D graphics. I say that's not at all the case. What I would like to see is a 3D game with a freely-moveable camera (a la Dragon Age,) and modern procedural animation that allows the characters to move over an effectively infinite variety of terrain. Occasionally the argument goes to this place where people are intimating that they don't want to see an archaic form of gaming that's not relevant to today's modern gaming - when what I envision when I think of a turn-based game making use of modern graphics and technology would be something a lot more cinematic, even, than - say - Fallout 3's combat, for instance.
that is a no-no in an RPG.
No, that's a no-no in the sort of RPG's
you like (and I generally agree with you, there.) That's not an innate property of videogame RPGs, however.