Can any one educate me on Porosity requirements for gold fingers?

BELLCORE TR-NWT-000078 14.2.2.2 Table 22 calls out ranges of 
acceptable Pore counts for given gold thicknesses. My question is 
what is the purpose of pore requirements? Is the implication that if 
the gold is to porous it is more susceptible to wear out and/or 
corrosion? Any help would be appreciated.

Thank you

Joe Pudlo