There’s many videos on procedural texturing but I’ve not run into a video that explores hand-painted/guided procedural texturing where you use masks to control the parameters of the procedural texture. It has an advantage over using procedural brushes in that you can change, morph, and animate after your brush leaves the canvas by adjusting the parameters. Another advantage is infinite resolution (render any resolution), perfect pixel density, consistent antialising/blur on the line work.
Edit: Sidenote: WHY is there so few tutorials on procedural (node-based) blender brushes? I want to use that in conjunction with the above method for more precise work, albeit destructive and finite in resolution.
Disadvantages: Longer setup time, difficult to get the variables right, difficult to get exactly what you want (but getting something exact is not my intention).
So far I made two node setups for this, one for freckles, another for weird painterly patterns. I would want there to be a big library of these node setups for all kinds of things.
I believe there’s also a way to use this to smooth out one’s linework, like drawing vectors(?).