Good question, easily answered. I voted for a top rank, considering the use case. First it looks pretty. It is virtually transparent with either MM and MC. In regard to the input C my take is as follows, assuming it is on the low side well below 100pF.
A user wouldn‘t care because he knows that analog, especially with mass distributed media as vinyl, is a bit vague anyway. Let alone flee market, well (mis)used rare copies. Take it as it comes.
A user would understand that in order to estimate the relevant C the tonearm wiring and the interconnect’s C are needed likewise. He would just measure it having a simple multimeter at hand, because such thing is quite naturally part of his household.
Each of both could go for personal preference in the end, tuning the C via critical listening, after minimizing the interconnect‘s C anyway.
A user asking for the amp’s C to be specified would most probably ask directly after for a switchable C, by numbers. That‘s a use case the X5 isn’t made for, obviously.