I never had trouble with it on steel either. Why they used nickel silver on steel will forever be a mystery though. I suppose it could have been because it was stronger, not that it really matters. I think the extra potential health problems argues strongly against it in that application. Maybe Dick Nolan didn't read too far into the fine print.

Someone with better heat control than me might not have trouble with type B on stainless either, it's just that the cycle designs flux makes it a lot easier. I can't imagine using either on a steel-only joint.