[Letum]

The models created by these kind of programs are far too "messy" for use in games.

Modelling real time assets requires a certain kind of 'style' in the way the shapes are made that computers are currently quite bad at.
Computers don't currently understand what parts of a shape are important, where symmetry should be or how to align contours.
These things are important when modelling for games, but require an imagination and understanding that computers currently lack.

These technologies are far more useful in video or film.