Its my job to help people not get in those bunkers.
And if they do, its my job to help get them out of them, even if it means coming out sideways, backwards or with a putter. There's really only one bunker on the course that I'd consider extremely severe, and even there creative options exist.
I very, very rarely see someone quit a hole at Old Mac, and its almost always not because they couldn't finish it (the beauty of match play), and mostly because they mismanaged their play. I see it happen all the time on the other three courses.
By your logic, any course with a single bunker "could" be unfinishable for a high handicapper. I'm not buying it, and I think you're reading way to much into Mr. Thomson's statement. Its a generalized thought, one that needs to be broken down in terms of course purposes (an elite test v. pleasure golf), course setup and levels of difficulty from different tees.
At its essence, its a statement on penal golf. But no one is saying that good golf courses must allow for a bad player to get around without getting into any kind trouble. That is a ludicrous extrapolation.