Ally
Yes, I realize the pedigree deal is actually referring to history.
You may be right about scale, but I would still contend that Muirfield plays small on a large site. When I think of the grand sites like Sandwich and Turnberry, it seems to me Muirfield is fairly small in how it plays. Perhaps the exact opposite is TOC, playing much bigger than its site would suggest. As a group though, I think you are right, but then again if maintained properly with lots of short grass, these courses should play large. I know on tv they always seem big so it was a real surprise when I first started visiting Open venues. Lytham felt very constrained, not surprising I guess with all the bunkers. But when I think of my favourite links, such as St Enodoc, Lahinch, Rye, Prestwick, Enniscrone and N Berwick - these seem small compared to Open venues. The one exception despite not having large greens and actual confined space is Pennard. Gosh, it seems the course goes on forever at times.
It occurs to me that the scale issue may be one reason why you liked Porthcawl so much.
I am not skilled in these matters, but it would be interesting to compare the size of Beau Desert's greens (which seem as a group large to me) with Muirfield's.
Ciao