I’m an expert user of Illustrator and I found Blender’s core UI choices weird and clumsy in a way that paid 3D programs weren’t. Blender fundamentally feels like it’s designed by someone who’s never used another art program in their life.
I'm an occasional Photoshop and Illustrator user (longtime Fireworks diehard, though, RIP) and while some conventions make sense to me, there's plenty of things that I have to look up tutorials for, even if I've learned them before.
Sometimes different software is different.
Yet many artists make amazing stuff with ZBrush.