Ummm, 3DS is owned by Autodesk, so you may as well consider them the same thing for this conversation, and Arnold is a renderer (also owned by Autodesk) and not a DCC, so not really relevant unless you are specifically comparing Blender's built-in render engines to it. The reason I am not is that there are lots of plugins for Blender which can output .ass files to be rendered by Arnold, so it can be utilized if you want to pay the subscription.

Blender is a DCC. Not one that I am super familiar with, I'm a Houdini guy myself, but honestly it is better in a lot of ways than the steaming piles of shit that Autodesk puts out. The question is not one of quality or feature at this point, but one of capital and market share where it counts. If they could figure out what is needed to get the likes of Disney or MPC on board, or even smaller (though arguably still very large/high profile) houses on-board, then they would be seeing much more investment.