Eric,

That becomes a religious argument. The flip side is, if you talk to pros like George DeWolfe they like to output considerably over printer resolution (last I heard he liked 480 dpi or thereabouts) and let the driver deal with it. Everyone has an opinion.

I have my doubts about not seeing any benefit to scanning above 180 dpi output - I can sure see a big improvement in my prints when I scan at full printer resolution (360 dpi) over 240 dpi, and certainly over 180 dpi. I see a lot less benefit to scanning at resolutions above 360 dpi however. My conclusion after my own tests is it's best to give the printer exactly the resolution it wants. This seems to be true of Epson printers and Lightjets anyway - the only two on which I've run my tests.

I always assume that there will be arguments over opinions. That's why I said "YMMV."