Point distribution can both improve surface finish quality and program run size depending on the settings and need.
Product surface finish is facetted and not as smooth as expected.
Use Point Distribution to greatly increase surface quality and in many cases surface accuracy. These settings are based on desired outcome and machine capabilities.
Please see an example of point distribution in use here: How to optimize settings to remove facets inside PowerMill
In general, it is recommended to start with a moderate point distribution and adjust as needed based on the complexity of the part and the desired level of accuracy.