Question

Why aren't all our fingers the same size?
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Answer 1

Answer:

Human hands have short palms and short fingers with varying length. These proportions make it possible to grip things in two ways that other apes (mostly) cannot. The second way is called a power grip, in which all the fingers and the thumb are wrapped around (like a fist) in order to grasp the object tightly.

In short, our fingers might be bulky and uneven for various reasons, and all theories suggest the evolution of the hand is tightly related to its functionality. It's impossible to make a fist similar to the human fist with fingers that have the same shape and size.

Answer 2

fingers of different sizes help in proper grip