being in the animation industry myself I've seen alot of professionals with this kind of attitude where they will look down on 3d animation as inferior to 2d. University lecturers were pretty much 2D animators with no experience in 3D animation so automatically they were biased. I've seen judges at animation festivals give no.1 animation award to a 2D animation which was incomplete even though there was an amazing 3D animation that came 2nd.
Alot of times, it comes down to simply "i don't know how to animate in 3d, i don't get it and hate it. I'll instead like the methods and style that i know about when it comes to the process of animating it".
On top of this, good 3d animation is hard to accomplish due to the technical barriers involved and the fact that a lot of smaller/new animators are indeed lazy when it comes to animating in 3D. Alot of 3D animation from new animators are generally generic in visual design/ artstyle (by that I mean they are imitating bigger studios like disney/pixar/dreamworks etc).
2D allows you to experiment and focus on the movement and flow a hell of a easier to since theres very little prep work needed. As long as you have good art skills, you can 2D animate.
Both styles are fine. I think the hardest personally is stop motion animation, easily the most stressful and time consuming form of animating with very little room for error.
Here's a good student 2D animation that I think shows off the inventive and experimental side to 2D animation:
https://vimeo.com/215498188