This might be similar to the masked brush approach in Krita that results in brushes like these?
I like it and it’s powerful in letting the user decide how the watercolour edge behaves - but, it makes the core transparent, and therefore not the same effect as other programs (You can’t for instance paint with an opaque brush or get the same colour as you have picked 
)
I think a comparison shows it off the best (Left: Original colour. Right: brush stroke example)
Krita
Clip
