"Make up"? the matte finish is slippery and there is nothing you can say to contradict that. You use your phone then way you want to use it but come here and tell me i am making up the fact that the iPhone's matte finish both on the iPhone 6 and 6S as well as the iPhone 7 is slippery with little to no grip at all, and no, Millions of people don't use their phone naked, most logical people use it with a case for added protection and grip, its a small amount of users that use the phone naked.
It's not slippery. You're making it up.
A bar of soap is slippery.