You can create beautiful 3D animation videos, but the problem is that it requires sophisticated animation skills and a higher budget along with more extended time. The best alternative to 3D animation is 2.5D animation, which offers you the best of both worlds.
Here is an example of a 2.5D animation explainer video.
The production of 2.5D animation video involves 2D images and 3D objects working hand in hand in the same platform. The 2.5D animation allows you to make your video more appealing and humanely if you are communicating something that requires a bit more sophisticated animation than 2D.