Why are pinkies so small?

Oh, dude, pinkies are small because they are the runt of the finger litter. They're like the little sidekick that never quite made it to the big leagues. But hey, they still serve a purpose, like when you need to delicately sip your tea or awkwardly stick it out when you're pretending to be fancy. So, yeah, small but mighty in their own little way.