If the boat has standard spreaders, versus swept back spreaders, and the shrouds connect at the same point on the mast as the forestay, the mast is supported at that point in THREE directions, but not the fourth. It can pump—which can lead to the mast fatiguing and failing.
You are right in that description. But have you seen any boats where that applies and the boat is large enough so that it matters. I think the smaller boats really don’t have a problem. But nevertheless you are right and I should have said something about the configuration you pointed out. I just don’t see it as a problem under any circumstances that come to mind. Now if you try to cross an ocean in a boat like that it’s a very different story.
All the best,