Thanks for all the replies everyone. I guess the thing that was bugging me was limiting a high-end enthusiast product to a single fixed lens and no other options.
After more thought, I realized that Sony, Sigma and Fuji actually had plans, but different execution.
DP1m, DP2m and DP3m provide a full range of useful focal lengths, but you need to buy a new body with each.
The X-100 28mm extension lens provides a wider option without needing to buy a second body, but apparently their engineers were not able to develop a tele-adapter lens that met IQ requirements. So, their customers need to go to a different product line for portraits and other telephoto applications.
The Sony has only its sensor cropping setting to get a telephoto effect. With 24mp on a FF sensor, this is a legitimate option.
So, I guess they thought this through more than I intitially assumed.
To bad the tele-adaptor for the X-100 failed, Fuji would have been nearly unbeatable with 28mm, 35mm, and presumably something in the 50-90mm range for the second add-on.