Brian:
No harm whatsoever.
As you can see agree on this far more than we disagree!
One week seems to be a standard trip for a lot of Americans. Hey, I concur, 10 days ought to be the minimum, but people do have jobs and kids and responsiblities so even taking a week is a lot for a lot of people. And in that week, well... as you can see it doesn't leave much time for uncertainties.
I guess where we might differ is that I look at trips like this as once in a lifetime things myself, so for me cost is to be damned, at least to some extent. That is, I'd sure rather play Carnoustie and TOC than Scottscraig, Elie or the like, at least on short visits like this, so cost be damned, that's where I'm gonna play - and as I said before, hell I live in California so none of them is all that much more than I'd pay for the standard issue CCFAD here! And playing these "big names" requires pre-booking and planning for the most part, as you know. Now if I went there 2-3 times a year, or lived there, then hell no I'm not gonna play those expensive famous courses - get me to Elie or Crail or Aberdour or anything else! It's just a matter of perspective.
So assuming one has no real good idea when he's ever going to get back there, well... I'd advise the two guys in a car for a 10 day trip to pre-book the courses they really have their hearts set on, then leave a little room for leeway and adventure. I just can't see doing what you say and not planning a damn thing - that's just too risky for my taste, and I can see these fellows coming home with lots of great stories, but wondering why they didn't get on any of the courses they had their hearts set on. They will have had a great trip, no doubt, but will always wonder what if... Not a good thing if you never can make it back there, that's all.
So how about a little of both? I did such on a big 3-week trip I made with my two best friends back in 1987, and we still talk about it to this day, it was that great. The planned rounds were great because we saw what we wanted to see, the unplanned stuff was fun just for what happened. I can't see it being better had we planned nothing...
TH