Because the pads on the PD are touch sensitive and the amount of pressure exerted determines the intensity, having them all glow constantly would defeat the purpose, much the same as if the knobs on the QC were always lit, or the faders on the FD.
Because the pads on the PD are touch sensitive and the amount of pressure exerted determines the intensity, having them all glow constantly would defeat the purpose, much the same as if the knobs on the QC were always lit, or the faders on the FD.