Does anyone know why is "predict kill ragdolls" turned on by default?

For anyone who just plays the game and does not actively keep up with all patchnotes and reading/exploring in-game setting descriptions (understandably a good chunk of the player base, including s1mple looks like), seeing a death ragdoll animation that's then reversed in the middle of the fight makes the game feel so unserious.

One good example of course is the recent s1mple's anubis mid clip. S1mple's reaction to it pretty much says everything.

To be clear, I understand the pros and cons of damage prediction and it makes sense that it should be off by default, allowing users to understand the settings first before turning it on.

But why is predicted ragdolls turned on by DEFAULT? (I saw folks saying "just turn damage prediction off" to s1mple's clip, that's why I was curious).

Edit: added link