Yeah, you are right, I should rephrase that info. I put the info in the FAQ, because I got some e-mails like “omg! I have to make my game all over again?? I was almost finished!.. noooo!” 
Not everyone knew, that it’s just a new template for Marketplace sellers, and not some new, mandatory core engine feature. So, if your game already works and you have all anims you need - you don’t have to change anything.
I also agree that the new skeleton is waaaaay better as a generic template for different models and animations. My animations also look better on the new skeleton.
The whole process of retargeting all my animations (it’s more than 800 anims at this point) took so long, because I didn’t just retarget them from “Blue Mannequin” to the new “Robot Mannequin”. I actually retargeted the animations from original mocap files, to achieve best quality, so I had to make many of them practically all over again.