Jay, the system we are discussing in regards to Riegelbau is not oblique or triangular bracing. It is s different concept that functions on different (although related) principles

The theory behind the long slanted bracing in German building styles is that a brace to a post compromises its integrity, so the braces here join to the sill and the top plate. This results in a lack of any triangles, so rather than relying on the immutability of the angles of a triangle to maintain squareness of the walls, we are relying on the fact that the brace has to stand upright for the walls to shift.

This is why we have to balance braces in this system: A brace slanting one direction has to stand upright for the walls to shift against its lean. The weight of the structure alone is enough to prevent it. In contrast, the brace simply has to fall over to shift the walls in the other direction, which the brace itself is actually actively encouraging to a small degree.

Contrast this to standard oblique bracing, where we balance bracing due to the nature of the joinery: a standard mortise and tenon only works under compression, so the brace is only effective in one direction. Contrast this further to older styles of oblique bracing using dovetail joints, which don't have to be balanced because the joint works well in either direction. (In most cases in southern Germany and Switzerland, slanted uprights directly replaced dovetail oblique bracing, without ever seeing the use of mortise and tenon oblique bracing like we are accustomed to in the US)

Setting history aside, and going strictly toward practicality I recommend using the large agricultural buildings of the central part of the Swiss Plateau as a good model to follow (since this is pretty much what they are designed to be: pure practicality without any fancy and unnecessary architectural elements like you might see in old cities or most of Germany)

Standard oblique bracing (triangles) can be scaled up to a point, once you get too large then they begin to act as levers and pry the posts out of their sockets. I suspect it is this fact that led to the invention of the Riegelbau style of oblique bracing, as carpenters realized that longer braces are more effective (study Swiss roof framing, where enormously long braces are frequently used) but have inherent issues in certain scenarios. (The English and French appear to have arrived at a different solution to this problem, tying their extra long oblique braces across multiple posts to negate the prying effect)

There is no strict Riegelbau framing tradition. Riegelbau is a general classification that includes a great deal of closely related framing styles. The only necessary element to classify something as Reigelbau is that a light framing method with an interruption between stories is used (thus the 'Riegel' or 'Rail') How the stories are joined together, how the structure is braced, etc. are all flexible. 'Riegelbau' is only slightly more specific than 'North American Timber Framing'