"The movie removed Piter de Vries personality..."
That's one of my biggest gripes about this movie...
Compared to the book or the 1980s movie, this version almost completely obliterates the rational for WHY Spice Melange was so important to the empire.
The abilities of the mentats? Completely erased.
WHY the mentats existed? Completely erased.
The explanation of how Spice permitted expansion of the empire? Watered down to about a quarter section left-handed coughed reference that really didn't make contextual sense.
It was all -- Well, Spice is important, because it's a psychoactive drug. Hell, it's almost as if Arrakis is the far future Colombia, Spice is nothing more than cocaine, and the Harkonnens? Pablo Escobar's boys of the future.