I'm agree with the arguments that only listening should be the main argument in using input capacitors in a system. The signal on a vinyl disk is already greatly pre-equalized, the cartridge has its own mechanical resonance frequencies in addition to the electromagnetical resonances (which is rather more complex than a sum of passive capacitances, inductances and resistances of a cartridge, tonearm wires, cable and input stage), it's even possible that the cartridge is made to assume some dumping at high frequencies in mind... So it is fifty-fifty you need the input capacitor or not.