The main contribution of the fighter in D&D is defence (AKA tanking). This has always been the traditional role of the class. Wizard is the damage dealer.
In prior editions, this was the case. 5e Wizard is far better at Control than DPS, even with the inclusion of the concentration mechanic. The only place they really compete for DPS is AoE, but the lower level spells tend to do 'meh' damage and spell slots over 5 are almost never replenished, limiting how many times they can cast the really good AoE spells.
With a min/maxxed build, melee DPS is consistently high and uses very few resources. Specifically I am thinking of smiting pally's and sharpshooter hand crossbows.
The tanking role is usually either a very high AC character of almost any class, or a raging barbarian.
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