Uhm yes I know that, but that's not at all what we're talking about.
It is in a sense since the previous Fallouts were great RPGs and offered this limited customisation hence why Fallout 3 did it so it would register to older fans of the series as-well, so it did succeed as a great RPG despite the lack of customisation. But I guess it is an opinion of yours that Fallout 3 was not a good RPG, but to me Fallout 3 was a great RPG, I think it pulled every string correctly when it comes to an RPG but I do not think better customisation would of made it a better RPG; again matter of opinion.
In Elder-scrolls games mix and matching armours was a good aspect of customisation, oblivion still allowed this but people complained about the simplifying of the armour so why would they come back to a game which they praised much more customisation just to give us un-customisable armours, which so far is pretty much a stamp of the Elder Scrolls series. From what I see so far, Skyrim offers much more customisation on the clothes and armour then any other Elder-Scrolls series, especially since you see pauldrons being switched for every single screenshot, the introduction of more head-wear instead of just helmets, and I'm guessing that Jewellery will still appear like it did on Oblivion.