Matching cartridge to phono pre amp. pF!?

I’ve just discovered what pF is. Well, I don’t know what it is but I was told it was important. I have the 2m Bronze and Technics 1210GR. I wanted to upgrade  from the built in phono stage in my pre amp to a separate phono amp. I was looking at the Lehmann line. The Black Cube Se II looked good until I read the specs. Only 100pF. The 2m Bronze MM specs says it prefers 150-300pF. How important is pF and what happens if it’s a bad match. What makes a bad match? Too low? Too high? I’m not sure where to from here or what to look for.
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McIntosh recommended 100pF knowing what interconnects and cartridge you are using? Or what? Because the best choice, if capacitance loading at the input is selectable, would depend upon those two variables.

In short yes, because I told their support line what I was using and what Ortofon recommended. The exact advise was to "start at 100pF" and adjust to hearing / taste.

There's not much data on pF for most interconnects. I did find the interconnect from Pro-Ject listed 100pF in their specifications but to previous points also need to factor in tonearm.

My point is 100 pF is a starting point and trial and error from there. On the MA252 the pF setting is locked in at 50pF.
Lewm and bpoletti have it exactly right. Capacitive loading is the sum of the capacitances of the tonearm’s internal wiring, the output cable, and the phono stage input capacitance. If Lehmann BC has 100 pF and your table has 150, not an unlikely value, you are close enough to Ortofon’s spec not to be concerned. A DIY perfectionist would add a small poly film cap across the RCA input jacks inside the phono pre. DB Systems sold a kit with Y connectors and loading plugs that achieve the same result without soldering or voiding the warranty. 
Moving coil cartridges are immune to capacitance loading. A factor in their superiority over moving magnet cartridges. The Grado moving iron cartridges are also not affected by capacitance. They have low inductance coils. The SoundSmith cartridges (derived from Bang & Olufsen) also are low inductance (moving iron, like Grado).