It's pretty common for pen and paper games to split raw physical strength and agility into two separate stats. The classic example is of course Strength and Dexterity (which also covers delicate manual tasks).
I think it comes from the notion that a very strong person is less likely to be agile and fast on their feet. But the kind of overall strength that a hand to hand warrior would have usually also results in great agility. Circus acrobats and ballet dancers are incredibly muscular and athletic. Huge linebackers tend to be quick and well coordinated.
And simulating manual dexterity isn't very useful unless you're playing a brain surgeon or a lock pick (both of which rely just as much on intellect and learned ability).
Have you played games where strength and agility are combined? How did it work?
I don't care for games with 7+ attributes. I'm more interested in how you get the most out of 3-5 attributes for a rules light game.