>>1331340You use the toilet paper first to clean anyways. To remove all you can. Then you sit on the bidet and let the water wash your ass, be it cold or warm. You apply soap as well. Then you dry with a towel separated only for the ass.
You won't feel that dry sensation on your ass after wiping, you remove any possible shit which would get into your underwear, no dingleberries, you feel cleaner, etc.
The bidet isn't thought to replace the paper but to get a better cleanliness. Although it can be used alone if you ran out of paper, which is an advantage.