I don't see why someone who has a higher DEX or AGL would somehow be better at acting first than anyone else. Dex-based Initiative never made too much sense to me in all my years of gaming, even from any notion of Simulationism.
I'm probably thinking too deep, but it does sort of harken the faux Wild West/Settler nature of D&D. Either the fast draw at high noon or whoever pulls their weapon out and dashes in first does the most damage before the enemy can react to the hero's whirlwind of death. Both images are sort of antithetical to the plodding nature of wargame on the table, though.