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For low temp/low friction assemblies like the gudgeon/pintles on a rudder, SS on SS should be just fine. Stainless is particularly bad for galling if forced together at high friction, and while that may be where your machinist was coming from, it shouldn't be the case here.
A quieter installation would be nylon or similar bushing in the SS gudgeon, but that is more custom, and would actually wear a little faster. Also some nylons/other plastics, when submerged, absorb water and expand, creating tight sleeves and extra friction.
Titanium is always nice... light weight, strong, corrosion resistant (grinny thingy here)
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)