I really can’t believe no one has brought the unreal links into the conversation yet…Getting Started with Character Morph Targets | Live Training | Unreal Engine - YouTube
For “questionable features included in unreal games” you can check out the godawful implementation they went with for ARK… actually it may be a really bad idea to point people towards what can otherwise be regarded as “poop” for an example… but I guess it is an example nonetheless…