Ment
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Defense is also a form of control, you know. You force your opponent to trade creatures.
1) There's no guarantee that the creatures will actually be "traded." The opponent might not suffer any losses during the attack, or the losses might be insignificant.
2) There's no guarantee that the wards will be removed specifically by attacking from the board, rather than by controlling the opponent. Not to mention that in certain cases, wards can be ignored by attacks/spells directly.
In short, it's not control. It can perform that function, but not to the same extent. With control, you can specifically choose what to do with the opponent's creatures, which ones, and so on.
Well, it's a matter of terminology and my understanding of it.