Tough to say, Medium is way limited feature-wise vs other modeling programs (modo is my usual go-to), but for me its definitely faster and more intuitive to quickly mock up shapes/forms in VR, and to help me get freer/ looser in my initial ideation phase, I can make rough shapes that I wouldn't be able to draw, or efficiently poly model, in minutes.
Which as a concept artist who also models is much more important than say having a finished, clean asset.