Aww darn, you beat me to it. But you detailed it better anyway.

Stall strips are used for several purposes. One is to delay the stall. On some planes testing during the certification process noted that the aircraft stalls at too high of an air speed to meet the classification qualifications.

Other aircraft were noted to have a stall that was too violent, and stall strips at specific locations were added to "buffer' the stall. Other aircraft had stall charicteristics that were not active enough in pre-stall warning, so strips were added to enhance the stall buffet.

BTW, there are also devices called "Vortex Generators" that are placed at many different places on the fuselage of some full scale aircraft to lower stall speeds and assist in preventing "Dutch Roll".

As a few others here, I have a lot of time in full scale medium and light aircraft.