Adding on to Max's point about that, 4 fingers would have a greater surface area, and likely a better grip for climbing also.
But obviously, we only find it difficult to do things while doing the Vulcan salute or whatever because we're trying to do a one finger job with two. Having two separate fingers next to each other makes it that much different and that much more difficult to do.
Our five fingers is presumably an efficient amount, though, given that the earliest land amphibians had 8 fingers or so, but never lost more than 5, so that must be the most usable amount for us.
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