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Is it worth spending a turn on a counterspell to prevent the enemy from blocking with a crystal against secret titans? Also, you can block not with something, but with someone. Titans may not have a penalty in melee combat, but they will still get a beating.
But the main point is not that, but rather the fact that due to their "bulkiness," titans don't really need ranged attacks. If they could be made even stronger but have their ranged attack removed, it would give mages more advantages.