As a guy who carries a full size (and weight) 10MM Gold Cup - most of the time, and has for over fifteen years, I can tell you why you don't find many Defenders lying about doing nothing.
People buy them and end up loving them for practical reasons!
First of all, they work - the first truly reliable 3" 1911 production gun, period. They are plenty accurate, with managable recoil and quick shot to shot times - for a LW compact. And I have to disagree that the reduced bulk and weight is not important - it is very important to some people and for some applications.
If your back sometimes hurts from age or overuse, and you switch from a 40 some ounce full size 1911 to a nice, light (a bit over half the weight) Defender, you WILL notice a large difference in the tug on your pants that you will appreciate.
If you must wear a shoulder rig all day for appearances, the lighter weight is certainly nice on the shoulders.
And the smaller size butt does make concealment, even in a waistband holster, easier. (Be aware that rubber grips - which come on the Defender - can grab clothes and "print" that you are wearing a gun. A nice set of wood Officer's model grips takes care of that.) Smaller people always have more difficulty concealing a full sized gun.
So as a guy that carries and uses both, I recommend that if you only have one CCW 1911, it be a Defender. Then add a "big brother" Colt to practice more with. You can't have too many Colts. CC