To not dismiss your perspective out of hand, in order to use smaller vertical-type mills and still tap higher altitude winds on masts would require support structures that can keep many more turbines aloft to supply the same electricity, and the electrical infrastructure to merge all the turbine electrical output and balance the loads to give a stable denoised power output to the grid.

The result is a much lower weight to power density in the smaller turbines, meaning much more expensive structural supports, and much more expensive power routing and station infrastructure. This makes such projects non-viable as they wouldnt be able to charge enough for the electricity to pay off the infrastructure over the lifetime of the turbines.

Smaller turbines like the one you posted DO have a great place in the power mix, for example for potential installation at the top of skyscrapers where the support infrastructure is already paid for by other uses (though the loads have to be accommodated by the building design, which still adds cost), or in low-altitude areas where steady winds exist and there is specific moderate electrical demand, such as in valley ports on islands or more remote coastal towns. In those cases larger mills would overproduce electricity demand, so smaller turbines at lower altitude are a good fit.