That is a pretty standard method, tbh there's a whole lot of ways people do it, not just the one you've listed as being for the longest time - I've used this config but with only two bones for the fingers (not ideal generally but was for that particular game). Obviously there's options with even more bones, there's no real…
For the longest time it's been 16 bones per hand: 1 hand bone + 3 bones for each finger = 16 bones total Do this in real life: Make a VERY TIGHT fist then a slightly more RELAXED fist. Keep constricting from relaxed fist to very tight fist. Now relax your hand completely and touch the tip of your pinky to the tip of your…