After several years of reading post on BF, it has become clear there is a concern about the human frame fitting the bike frame.

Clearly a human frame of 400lbs and 6' 7" is not near the center of the bell curve of human factors of design of most bicycles. It is no wonder that every steel bike is unacceptable. Considering that frame of reference, also having some education (degree) in mechanical engineering, I would be more concerned about AL as a frame material of choice than steel (at least it gives you a warning). Any OS tubing would be marginal or the beginning tubing of choice for such a human frame. The fact that any bike designed for the most common range of human factors works at all is an amazing statement of the safety factor considerations in design!

Judging most bicycle design, including material, and components, with such a frame of reference using declarative statements such as "...believe me when I tell you all steel frames suck!" is more a reflection of the persons perspective than any truth in the statement. For him they suck. For the majority of us, discussing C&V, they are great! It is all relative. Some times the frame of reference is an outlier. That is not good or bad, just a data point. However, the presentation might be judged as good or bad, acceptable or objectionable.