1.

I've previously used Tinkercad to create objects from primitives and it works very well. Asset Forge's pre-made blocks are great, but the app falls short on one killer feature (that Tinkercad does well). When exporting models, all the blocks seem to be simply grouped together and nothing is done to handle vertices and faces that touch or intersect. That makes for a sub-optimal workflow when trying to unwrap the model. For example, where a plane wing intersects a hull there should be no wing vertices / faces inside the hull block. Instead an intersection algorithm should generate vertices around the plane of intersection and indices adjusted / added.

2.

Unfortunately the game engine I use does not support OBJ MTL materials (colors & textures). Instead it uses diffuse, normal, emission maps etc. It would be great if models could be exported with baked diffuse maps (atlas) and appropriate UV data. Otherwise I have to take the model into blender and manually unwrap it (and then run into problem number 1).

If my problems are not actually problems because I've missed something in the application then please let me know. However, at the moment I'm having to go back to other tools for production.