Nick you need to start smoking a different weed this ones not agreeing with you.

Regards 3D models then I agree on the time wasting rendering but not the creation of 3D models.? When designing a machine, esp complex or tight fitting then being able to test fit together in 3D space can be priceless. Also most 3D models actually starts with 2D drawing and it's just few clicks to turn 2D to 3D so why not.!