That doesn't make any sense, crafters are about to have the biggest pull in the economy that any class can possibly imagine. Why would you say its only fair to limit combat with craft? They are two very different functions of the game.

I say this because before I rerolled my character (trying to find a good server) numerous times, I had Carpenter, Blacksmith, Armorer, Goldsmith all 30+, but I'm all for this kind of specialization. It will ultimately be a good thing that encourages having a diverse and strong economy. Just remember you won't be locked out of leveling your crafts to 50, you just won't be able to gain access to everything at once, which is how it should be anyway, no?