I understand what Tom Doak (and Golf Digest) is trying to say. I think we ALL understand what Tom is saying. But I think Tom's description, while a good one, is more about Shot Value than Resistance to Scoring.
Think Augusta National 10 or 20 years ago: incredible shot value! It would tempt you here, you would resist there, you'd take a risk now, you'd back off later. It would be "challenging, interesting and fun for the scratch player". However, it's Resistance to Scoring wasn't very high.
Nowadays, Augusta National seems to be more about Resistance to Scoring, and has lost Shot Value. And we all seem to think that it's suffered for it. So in that sense, does Resistance to Scoring belong as a criterion for great courses?
But I'm trying to go deeper.
What is a difficult course?
Is it simply in relation to par? If so, is Pebble Beach at the 2000 US Open (as a par 71) a "better" course because, all other things being equal, it offered more resistance to scoring with the 2nd hole as a par four?
Please tell me there's more to it than that! And if so, what is it?