I teach digital painting, and Procreate is slowly becoming my enemy. I fully appreciate its ease of use, its fantastic union with Apple Pen and certainly my students love it. But doing design/creative work on a small screen is not healthy, especially for complex images. neither is it easy to maintain a complex workflow, such as that required by matt painting and multi-layer compositing. Also, any presence of tablets in a design teaching lab is never pretty... I can't easily review their files or integrate their output into a pro desktop app.
Cost is likely another big reason it’s popular with students. A $13 one time purchase is hard to beat… even with edu pricing Adobe CC quickly gets more expensive. Clip Studio Paint falls somewhere in the middle.