Are the internal routing and cable management systems of the Pinarello Grevil+ Disc truly optimized for gravel riding, or do the limitations inherent in the frames Italian design ethos compromise the bikes overall functionality in this regard, especially considering the presence of a front derailleur and the resulting added complexity, and does the Grevil+ Discs emphasis on sleek lines and aerodynamics unduly restrict the options available to riders seeking to customize their bike with alternative component configurations or run 650b wheels with high-volume tires?