I hear you, it's like that in Red Orchestra where there's weapon limits. On some maps I always get to be the Sniper because I'm the fastest loader.
As Deinos said, all the mission critical weapons would be gone but if you look back at BF1942 there really weren't any mission critical weapons. COnquest was just TDM in different points all over the map. Class selection will probably be the same way it was done in BF1942.
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