Like Brian, I bought most of my LF Schneider lenses way back in the late 70's and early 80's. Over the years, most have developed Schneideritis, but I've never noticed any affect to my prints (I don't measure densities, except when I'm testing film.) If this anomaly does affect contrast, it has never been enough to cause me to bump my VC enlarging head by even 0.1 units. Again, at least as much as I've noticed.
Not to sound snarky, but if you're worried about resell value, buy one with it! Or, buy a beautifully mint condition, absolutely clean, no Schneideritis to be seen copy and bear the brunt of lower resale value, if your lens develops this issue. Not all do, btw. My Schneider 360/6.8, for example, that I bought new in the early 80's is still pristine today.
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