I think I have justified it enough. DF keeps track (or will keep track) of enough information to "simulate" Strength (mainly mustle), Toughness (a combination of many thing like skin material, blood pressure, blood thickness, bone density+elasticity), and Endurence (efficiency, Willpower, metabolism, calories), because put simply, those do not depend on knowing the shape of the body. We could add 50 different other factors to those, but produce an argument that any of those need knowing body shape. You could say that Toughness also includes blood salinity, but soon, we'd be tracking that.
I disagree still. You are advocating the removal of the abstracted "strength" value (among others) on the basis that you can bring it from hundreds of other variables that are tracked.(for who knows what purpose, since it increases calculation time, but for the purposes of this argument, we are ignoring that, since we cannot be sure exactly how much)
Human strength, since that is what we have chosen to focus on primarilly, is a very complex little pickle. First you have to agree how you are to measure strength, since there are many different ways it could be measured. We'll measure strength with two swordsguys. We have one real bulky swordsguy with muscles on muscles. Next to him we have a fit guy who just has muscles. Let's take a look at their structure and see who is stronger...
First, a little class on how arms move...
A human arm is constructed in billions of variations. They all have some pretty solid basic principles behind them, but these aren't manufactured objects created in a plant with very tiny tolerances. Tendons are attached at different points in these arms and arranged in different ways. Like I said, Millions of variations.
Paying attention? School isn't out yet.
A muscle is basically a cell that can lengthen, shorten, or remain the same size. This is how all locomotion in a human body is done. Your brain fires chemical signals to these organs to make them grow or shrink. This shrinking and growing of the length of the cells causes your bones to move, since the bones are connected to the tendons which are connected to the muscles. Now when the muscles tighten, they are attempting to bring their tendons closer together with tension. This might cause an arm to flex, or straiten out. It might move weight into the air, or open the hand to let go of something. Usually several different muscle groups are working together to do each action.
Ready? Here it comes...
When a tendon is connected to the bone half a micron higher than in another person, you are changing the physics required for the muscle to operate. Some operations will require more work for one individual than another. With half a micron, you are talking about a very tiny amount of effect. Something that could be lost in rounding errors, though if you were precise enough you'd see a difference. Let's toss a monkey wrench into things though, and let's say that one muscle is now on a object that is two entire inches longer than another.
You are now not talking about an amount that is infinitesimal, but about something that is a great deal different. Now let's put one tendon twisted about 1/32nd of an inch along the arm. Now you have a situation where you cannot even compare muscle mass in a scientific way, because you have two entirely different systems of doing something.
This is what human strength is, and why you cannot really "measure" it. Give one guy 2 inch longer arms and twist the connection points of one set of tendons, and now they have two different capabilities in using their arms. One is much stronger than the other one in certain actions than the other.
One might have the perfect body build to be a swordsman, while the other has massive inefficiencies for it. for the same result, one would have to spend a lot more effort, but that one that isn't built for swordsmanship might be perfectly built for axeplay, and they'd reverse their build if they were both axemen.
So, in our above example, they have equal strength, even though one is much bulkier than the other.
Tracking muscle may give an IDEA of strength, but it should remain a derivative of the strength attribute, and not the cause of the strength attribute, because we cannot track the connective location and efficiency of every tendon in the body.
If I'm wrong please correct me, but I don't think I am.
Something like this exists for every single attribute you think should be replaced with something else. RPGs abstract a lot, because there really isn't any other way of doing it.