There is a lot of things that could be added. However - when you mention “other full-featured” programs please keep in mind, that Nomad costs 15 bucks. And considering what these 15 bucks buy you (just take a look at what’s possible in the “Arts” section), I’d say that Nomad is a deal like none other. Yeah, Blender is for free but there is no mobile version
You can create base meshes by smashing all kinds of basic shapes into each other. You don’t need to clone a sphere every time. The tube tool is also pretty good for creating basic limbs because in the tube tools options you can activate individual radius for each point of the tube. Just take a look at this video. That should explain everything you need to know.
