Synthetic attributes

chromatic writes about synthetic attributes. I wonder why this is not more widely used - it's such a simple technique. I've been using it since I discovered Moose and all the time in the back of my head I had this thought: Why people don't use this more widely? It is so obvious solution to the testing problems. Maybe they know something that I don't? But maybe it is just the matter of some guru (like chromatic :) writing about this technique?

PS. Sorry I'll not explain what synthetic attributes mean - this post is only a comment. I cannot currently comment at chromatic's blog.