Also,

These screencasts, I created awhile ago, touch on the stuff I mentioned:

https://youtu.be/R5DF822U89w

https://youtu.be/jNkNNawmfJ0

Ironically, the green model shown in the screencast is a case that just won't work with Rhino, even though it looks fine. It won't calculate a volume. Also, as mentioned in the screencast, I have had instances where Rhino will calculate a volume but the exported step file is not valid. So if you try to mesh it for FEA it won't work. So generating the root fillet is a huge pain in the butt. Even with years of practice. It's hit and miss with no clear idea of what is going wrong. Michael has talked about getting a new fillet engine at some point. That would be welcomed.

The automation of the blade creation has been worked on from time to time by forum users here. But, as far as I know, nothing has been completed yet.