With all due respect, I think you are conflating your own familiarity with intuitiveness. I’ve used SketchUp intermittently for 10 or 15 years, yet I still found Shapr3D to be easy to use and at least as intuitive as SketchUp or F360 or anything else.
Certainly, SketchUp is a more mature application (but far from perfect IMHO) but Shapr3D has steadily improved over the years at a pretty impressive pace.
And frankly, on the iPad at least, it is the only game in town. The SketchUp web interface is painful and inefficient and doesn’t properly utilize the (game-changing) Apple pencil. Nothing else available on a tablet even comes close to its capabilities.