Its biggest issue right now for me is working with text. For example, sketching text on a model then extruding it to type on the model. They finally, like last year, added a text tool; its bad; primarily in the sense that you have to specify the size of the text upfront, the size you specify means literally nothing with respect to the model (just an integer). So its a dance of "op 20 is too big, lets try 18, lets try 15, ok 16 isn't perfect but fine". To be frank, I don't know how it existed for so long, at multi-hundreds-of-dollars per year, without this basic feature, and I can't imagine anyone involved feels pride in its state today.
It also doesn't have any document sync capability, which is unfortunate because, generally, getting files on and off iPads is a hassle; and Shapr3D's Windows & Mac apps have to my usage perfect parity.