Apple hired a guy for making THAT? I've used Tilt Brush (VR painting), Kodon (digital clay sculpting), Tvori (VR 3D animation), Gravity Sketch (industrial design), MakeVR (CAD), even a plugin for SketchUP that allows architectural modelling in VR, and that youtube clip looks like just about the single worst VR UI, indeed single worst anything, I've seen in a VR creative app.
To start with - 2d painting on a flat surface in VR? What's the point? It's not like Kingspray, which is an astounding simulator and gives you a fully realised 3D world to work in, it's just a garbage painting app that happens on a screen an inch from your eyes... meh. Tilt Brush is a place you walk about in, painting freestanding three dimensional objects.
Ahh, it's for standalone VR headsets, that makes sense. Look, standalone VR isn't going to happen to any great degree, any time soon. Accurate six degrees-of-freedom tracking without a dedicated environmental cue (lighthouses) is always going to chew up huge processing power on environmental recognition, and provide a less stable "thereness" to the experience. What makes VR a great place to work, is that it's actually a place you go to, that you can walk around in.
Also, mobile graphics hardware simply isn't up to the task. We're still at the point where the highest end GPUs (1080ti) are the entry level for doing this stuff well. You're not going to see that in mobile for a while yet, and in the meantime desktop GPUs are going to keep gaining capability, and empowering greater detail, and scale to simulated environments.