My engineering predates CFD (although my son impresses me with his incomprehensible knowledge of the subject) and I haven't had any need to get involved.
Not being an engine design man, I can only go on my reading on the subject. My limited understanding is that any turbine has a comparatively narrow useful operating envelope, regardless of whether it is driving a shaft or throwing air out the back.
So far as the performance is concerned, the jet can be described in a reasonably closed form manner, whereas the turboprop needs a rather messier approach.