I have maybe a hundred paint draw apps for iPad Pro and I have an Apple Pencil, but I can't find any that start a stroke with a realistic initial contact. They all have the half round shape of a regular stylus. I have a brush stylus also and its only advantage is tactile.
On my Mac I also have numerous apps, but so far I can only see Photoshop, Painter, and Rebelle as having a realistic initiation of the stroke. I was very disappointed that Krita and ArtRage do not.
I have googled mightily to find the proper terms for the leading and trailing edge of a brush stroke but have had no luck. I'd like to know if there are any such terms, corresponding to attack and release of a musical instrument tone.