You seem to keep avoiding my main contention, heat effects alum much more significantly then steel. Why?

Wilwood is the typically lightest alum hub from what I have seen. I thought my point was understanding that wilwood using any small bearing makes for a small hub, a large bearing, even though having higher bearing capacity, makes for a larger (stronger hub). The others I have less experience with. Alum can be and is best solution in almost all applications, IF the design is correct, concerning material, material thickness, additional cooling to reduce brake generated heat, and finally the intended application, drag vs open track, vehicle weight, track speeds, braking duty, driving style, tire/wheel combos, etc. Your list only means no one has reported failures or are not reaching the limits (show cars?), not that the design is ideal. I guess this discussion should really be for those that have track time that have actually had on track heat related brake issues/concerns vs those that have not. I'm speaking from the former.

There are racing organizations (and/or manufacturers) that do not allow RF alum hubs, I suspect that reasoning is more based on fatigue failure from repeated high loads.

The Ron Sutton alum hubs for instance and the Wilwood alum hubs are light years apart, and not intended to be part of this discussion.