Here is a video breaking down a rig for Puppet Animation. Personally I’m okay with it if it is creative and good. I guess because I come from the old flash days when you had to do things differently because there was no streaming at the time. Tween animation helped keep file sizes down. Because of this I’m okay with this type of animation if done correctly.
Here is a tutorial breaking down a rig.
Here are examples of good old fashioned tweening. Funny thing is this has become really popular over the years even in mainstream work.