What does this mean, exactly? It makes sense to me that certain races should excel at different things, both from a TES lore perspective as well as traditional fantasy game archetypes. I would expect an orc to excel at physical combat and not be as good as a stealthy or magic using character. Does this mean you couldn't play an orc as a sorcerer or an Altmer as a war hammer wielding loincloth wearing barbarian? Of course not. But they shouldn't be just as good with either play style...that's boring.
As TES is currently, some races are more gifted in certain skills initially. But if I want to create a character who was born an Orc but rebelled against the expectations of his brethren and had a burning desire to excel as a mage, then he could put the effort in and actually excel as a mage. It would just be more work for him than for an Altmer. (And TES has many NPCs which fit this 'going against the grain' trope). I don't believe that every race should be identical except for appearance, just that it's possible for a player to develop any race to be the 'best' at what they want to be best at.
These arguments seem to be wanting to impose MMO limitations on TES. The racial restrictions in (older) MMORPGs are there because they are necessary for that kind of game design, not because they are good. The need to restrict what role a player has in a group/raid situation is not pertinent to Skyrim. And newer MMORPGs like Rift are doing away with the restriction of 'role' anyway, which I think is heading in the right direction. We are lucky that TES has already arrived there.
Edit: To answer your question, if I was going to build a tank to raid in an MMO, my choice of race would be an important strategic choice, and everything else would have to take a back seat to end game strategy, but in a single player open world my choice of race should be about the character I want to play. It's identity in how it looks, how it is treated by NPCs and what back story I might create for him/her.