Animations are extremely specific, in ways far beyond anything even touched on here. For instance, none of my handmade guns fits any of the UE4 animations. The hands are either not tight enough or way too tight. There are no usable melee animations. The list goes on and on. Making your own from scratch is always easier and better. That goes for characters too. Much of the difference between a decent game and a great game can be found in the specific minute things. Original characters, weapons, animations. The animations breath life into a character. Like the way the Assassin in Borderlands spins his revolver like a cowboy when you’re standing around doing nothing. It doesn’t seem like much, but it’s cool.