Well, I managed to read it all ;p . I will try to pose a couple thoughts for arguement's sake.
'Consumer' products, are generally the lesser of like. By this I mean that the lower dollar figure attached to an item in a similar line could be considered as 'consumer' rather than 'pro'. Examples might be a Leica RF being a pro item where a Zeiss Ikon RF would be considered consumer. Though this may have been the case, the Zeiss is a fantastic camera with which I have made many great photographs. Another example would be the 35mm SLR systems for Nikon and Minolta in the 70's and early 80's. The Nikon could be considered the 'pro' setup where the Minolta could be condsidered 'consumer'. And some of the best glass out there is Rokkor and Vivitar Series 1 glass. In this vein, I would venture that 'Consumer' is not always merely a step sister to the 'Pro' product.
I differ in opinion to your assessment of medium format glass at wider apertures. As you say, and I DO agree, without side by side testing it may never be known for certain the varying degrees of effectiveness of each tool in varying mediums. However, MF glass, by and large, performs great at wider apertures, IMO, or else they would not offer MF lenses with apertures wider than an arbitrary f/8.
A very well thought out and well written article. Thank you for sharing your thoughts with us.