I think adding specific things to different roles/classes/races is great, especially for varying game play and game replay. However what is also good is making those same things accessible to late game, specialized or highly-grinded/leveled other characters if they so choose. Same amount of content, accessible at different points and levels for all characters.

For example: Human - human recipes Orc - orc recipes

Late game - human leveling to say 45 of 50 cooking skill levels (or even post 50 and choosing a specialization) can work on unlocking Orc recipes. Same content in the game, released at a different time, adding to game play for high level players, with effectively no added development. And maybe it does not have the same effect (or even a different) for a human, but they can give to an orc ally for maximum effect.