What you said is right but let me ask you a question can you do 3d modeling if the answer is yes you now how much time it takes
Viewing post in Why Everything is 2D on itch
Yes, I can model (not professionaly, I'm a programmer), it depends on the size and level of complexity of the model it can range from 20 minutes to weeks.
Same goes to pixel art, it's not more or less complicated, it's just different, and also modeling is just one of the 3D art areas, there's sculpting, texture art, rigging, skinning, environment, lightmaps....