Why There Is not a Opacity Controller due to Pen Pressure?

I would imagine it's harder than it looks. In Photoshop, you're just dealing with pixels so this is trivial, however unlike Photoshop, Animate is a vector program, with a completely different drawing engine. You can only have opacity in two ways: reducing the alpha value of the swatch, or with symbol color effects. To have something like this, Animate would have to keep each stroke into separate objects, and even then, the end result would be limited since most likely it'd be the same opacity level across the entire stroke; then there's the issue of the paint bucket fill that requires all lines to be flattened to function, once the lines are flattened, bye, bye variable opacity.

I don't know what it would take to make true pressure-sensitive opacity levels on the same stroke...it seems simple, until you realize, no vector program does this, none of them.