Trying to understand this schematic
Is there any benefit to separately buffering a common pin for each output?


It's a best practice for daughter cards to buffer all input signals, and thereby isolate the "original" input signal from the "working" signal that's used by the components on the daughter card.

Imagine having multiple daughter cards stacked onto each other, and each card tries to use the original signal. Connecting more and more digital loads to the same signal path can easily overwhelm the signal source's maximum fan-out specification.