One of the little known, and less appreciated features of the 1911A1 (and the original commercial Government Model) is that they can be detail stripped using only one "tool" that can be a twig, pen, a rifle round (like 06 fmj) or anything with a small enough point to depress the firing pin. All the other "tools" needed are the parts of the gun.
Allen head or torx head screws defeat this.
They my look nice, but personally, I would replace them with the standard slot head screws, for convenience.
Your choice, of course.