Same way as we can mix and blend colors on the “wet palette” it would be interesting to be able to do the same on the miniature itself, that way painters would obtain smoother transitions between colors. It could be a differet brush option.
you can already do that type of thing using combos of washes and air brushing or dry brushing and the opacity slider
I don’t say it can’t be acomplished with the current tools… But same way in “physical” miniature painting I can chose between different approaches to an effect, it would be nice to have same options in-game.