Definitely, I ask myself whether it was useful to introduce fractional partial differential equations.
As based on fractional differential operators this class of equations also surfers from the same drawbacks as the one described in:
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Fractional partial differential equations were introduced to model anomalous diffusion, i.e. phenomena that exhibits power law behaviours other than 1/2. But it was shown recently that these kinds of behaviours can also be obtained with classical partial differential equations with spatially variables coefficients:
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Where it is difficult to propose a physical interpretation with the fractional partial differential equations, classical partial differential equations with spatially variables coefficients allow interpretations relating to the geometry of the systems studied.
What is your opinion ?