Is it? It is often pretty onscreen, but is it pretty reliable in use?
This is similar to RF: We can use intermod software, best practices, etc., but none of it will tell us what is truly present in the atmosphere. You gotta measure
The only prediction software I use is L-Acoustic SoundVision, and it is very good. If the software says the coverage is good, it is. While I rarely use it, Meyer Sound's MAPP is also very good, but, at least the last time I used it it was not 3D.
As Ivan said products like SoundVision do not model the room, they model listening planes. You do not need all the measurements of the building, only the surfaces of the audience seating area.
Mac