It's a condivisible analisys, but I think at Fuji's headquarter they decided to bet on providing the best lenses possible, in order to differentiate themselfs from other manufacturer. I remember
reading an interview some time ago, in which they responded in merit of the characteristic of the XF 16-55 f2.8, and why it was so big and without OIS. They stated that they are seeking for the
best optical performances, sacrifying other aspects, like portability.
Probably the have see that the xc zooms don't sell very well and don't want to invest money in a risky field... maybe in if the new 35mm f2 will sell well they may try to taste the situaton with other cheaper,
smaller version of some of the existing lenses.