I think one should consider the whole building when looking at design and engineering, If there is boarding going on the frame, then what work is the boarding/Sip/strawbale/whatever able to do to stiffen things up?
That being said, there are times when walls are not enclosed, as in a pavillion, and a frame that can stand on it's own is neccessary. So talking about brace tension or other ways to stiffen the frame is a good thing, at times a neccessary thing.
If you're looking for tension from braces, you need the same things that resist tension in tiebeams... long tenons and multiple pegs. If we can give value to the ties, we can we not give value to the braces????