It seems inconceivable, to bicycle manufacturers, that I want to tour or commute with a racing bicycle, rather than buy a separate bicycle for touring.
Also, they will try to fit you on the largest size bicycle that you may be comfortable riding, for the purpose of market segmentation. Apparently, it is easy to brainwash the bicycle shops.
“ The typical LBS pushes new riders toward large frames with short stems, mainly due to the taller head tube “
” The problem is, we want to be comfortable, because riding shouldn't be torturous. Guys whose only job is to go fast eschew such concerns-- there are 6' tall guys on the Tour riding 54 and 52cm frames. ” (he says torturous because of the lower height of the head tube, however I find having the handlebars lower to be more comfortable, because my arms are extended with only a slight bend at the elbow)
You will only be able to find one, or maybe two, medium width 650C tires (ISO 571mm diameter) still in production (see Team Estrogen for 650x28mm or above).
You will likely not find many narrow or medium width 650B tires (ISO 584mm diameter) (see 650B Palace for sizes below 32mm or 1.3“).
So, not only will they fit you on a larger frame than is comfortable, you also have less choice for smaller cyclists, to ride a bicycle with proper geometry for their size (see http://www.rodbikes.com/articles/700-compromises.html). It's not about choice, it's not about customer satisfaction. It's about fooling the customer into giving more money.
“Manufacturers need to invest the time into developing the technology,” he adds, “but probably won’t do this until a desire to invest time into learning the system is expressed by the rider. That leads to a comparative shortfall in the availability of the year-round tyres a great proportion of road cyclists use.”
For an almost negligible gain in rolling resistance, manufacturers are the driving force to further segment the bicycle industry. By introducing incompatible technologies, less parts and bicycles are re-used, which drives up the demand for new bicycles.
When coming across bicycle forums on the internet, I wonder how many users are actually corporate employees, paid to express their “real life experiences”. I wouldn't put it past some corporations to do this.