In transformerless mic preamps using low noise bipolar transistors or ICs, there can be a significant input noise current term. This input noise current is multiplied times the input source impedance (in parallel with input termination) to generate a noise voltage term that is combined with other input noise voltage sources. In principle you could tweak the input stage current density of a discrete preamp to be better optimized for the higher source impedance, but you are still dealing with more total noise.
In addition, increasing capacitor impedance in the mains hum frequency region could negatively impact common mode rejection if the capacitors aren't closely matched.
In general an active 2 pole HPF added after the mic pre stage is much less problematic. If you have the panel space available a pot could make this HPF stage adjustable.
JR