Why is there no blur brush?

[cmoss]

After using painter for a while now, I'm baffaled by how many seemingly basic features it's missing. Why doesn't a basic blur brush exist? And no, smudging doesn't count, it's a pain to blur things that way!

[BrunoBorges]

I did this some time ago, try it and then tell me what you think.
(i did this to mimic the way Mudbox blur works, it's not the same but it has been suiting my needs until now)

https://share.substance3d.com/libraries/3110