The channel model for mmWave frequencies is often depicted as consisting of finite number of clusters with finite number of rays per cluster. How same channel is applicable for the whole frequency range from 30 to 300 GHz? Is there one-to-one corresponding between the number of propagation paths and the frequency of millimeter waves?
This is ongoing research topic. There are slight differences as we move above 100 GHz e.g scattering rich environment and sparse channel. You can see many tutorial papers by IEEE survey and tutorials, that have discussed this in detail.
Modelling paths by ray optics is an approximation which is most accurate at higher frequencies. For that reason it can be used over a wide range of frequencies, provided they are high enough. At the lower end diffraction may make the result less accurate, and at the higher end surface roughness may make the results less accurate. Corrections may be made for this, such as by using frequency dependent reflection coefficients.
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