I don't see why Strength and Dexterity would be seen as more complementary than Strength and Wisdom given the way 4e is structured. So far, the only classes really prioritize Strength and Dexterity in the same build are Fighters and Rogues, although Barbarians and melee oriented Rangers definitely benefit from the Dexterity. Strength and Wisdom are important to weapon using Clerics, melee-focused Rangers, Wardens, Strength-focused Paladins, and Fighters.
One interesting element of Half Orcs receiving boosts to Strength and Dexterity is that it promotes using the race in a manner that is consistent with their initial appearance in AD&D where they had decent progressions as Fighters, Thieves, Thief-Acrobats, and had an unlimited progression as Assassins. They could be clerics, but only had a minimal progression.