Is there a reason a flying creature would evolve "wings that act as hands" instead of "wings with hands attached"?

A rare design I have seen in fantasy games is a wyvern or humanoid being with hand like wings to fly The Pokemon Yveltal is a good example

I'm curious if this is in any way a practical design and the reason something like this would evolve over classic wyvern or bat wings which serve the same function; grip and flight. The fingers on these wings would have minimal articulation compared to bat wings and are considerably heavier in comparison, aswell as having less surface area. Almost all designs like this have very large claws at the end like a hand.

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Is there a reason a flying creature would evolve "wings that act as hands" instead of "wings with hands attached"?

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